Abstract: An ballast tamping assembly comprises four independently displaceable ballast tamping units arrayed in a line extending transversely to the machine frame elongation. Each ballast tamping unit comprises a carrier frame, a tamping tool carrier vertically adjustably mounted on the carrier frame, and a pair of vibratory tamping tools mounted on the tamping tool carrier for reciprocation in the track direction.

Abstract: A mobile ballast cleaning machine comprises a machine frame, undercarriages supporting the machine frame for mobility on the track, an excavating chain mounted on the machine frame and arranged to excavate the ballast to expose the subgrade, a ballast screening installation arranged to receive the excavated ballast from the excavating chain and to clean the received ballast, a conveyor arrangement for conveying the cleaned ballast for distribution on the exposed subgrade, a power-actuated, vertically and transversely adjustable track lifting device mounted on the machine frame, and a vibrator connected to the track lifting device, the vibrator being arranged to generate horizontal oscillations extending transversely to the longitudinal direction.

Abstract: A method for continuously consolidating ballast under a track comprising rails and sleepers which are arranged transversely to the rails by a machine having tamping picks, comprises causing the tamping picks to pick up the ballast in front of the sleeper ends and push the ballast under the sleeper ends by a cycle of shovel movements comprising a consolidating movement in a direction which is parallel to the sleepers, an upward movement occurring immediately in front of the sleeper end faces, and a return movement counter to the consolidating movement, and continuously causing the tamping picks to repeat the cycle of shovel movements. Desirably, a continuous forward movement is superimposed on the cycle of shovel movements.

Abstract: A track working machine for the controlled lowering of a track comprises a machine frame, at least one undercarriage supporting the machine frame on the track for mobility in an operating direction, a track stabilization unit for compacting the ballast whereby the track is lowered, the track stabilization unit being vertically adjustably mounted on the machine frame and including rail-engaging roller tools subjected to substantially horizontal vibrations extending transversely to the machine frame and the track, and a broom vertically adjustably mounted on the machine frame ahead of the track stabilization unit in the operating direction, the broom being rotatable about an axis extending transversely to the machine frame and the track.

Abstract: An assembly for tamping ballast underneath three successive ties comprises a vertically adjustable tool carrier, three pairs of vibratory ballast tamping tools mounted on the tool carrier and arranged successively in the longitudinal direction of the track, each tamping tool including a tamping pick and the pairs of tamping tools being so spaced from each other in this direction that two adjacent proximal tools of the three pairs may be immersed in the ballast in each crib defined between the three successive ties and a respective distal tool may be immersed in the ballast in a respective crib adjacent each of said cribs, two crank shafts mounted on the tool carrier and spaced from each other in this direction, and reciprocating drives mounted on the tool carrier and connected to the tamping tools for reciprocating the tools in this direction, the reciprocating drives connected to the two proximal tools in each crib and the distal tool adjacent thereto connecting each crank shaft to the two proximal tools and

Abstract: A continuously advancing track maintenance machine for compacting ballast comprises a self-propelled machine frame supported on the track for continuous advancement, a power-driven and vertically adjustable track stabilization assembly mounted on the machine frame and comprising rail engaging roller tools, a drive for spreading the roller tools into engagement with the gage sides of the rails, and vibrating means for imparting oscillations to the roller tools in a direction extending substantially in a horizontal plane transversely to the longitudinal machine frame extension whereby the roller tools engaging the rails transmit the oscillations to the track, a device for measuring the amplitudes of the horizontal oscillations, and a reference system for monitoring the track level between an actual level of the track and a desired level thereof.

Abstract: A mobile ballast tamping machine comprises a tamping unit associated with, and adjacent, the field side and the gage side of each track rail, the field side and gage side tamping units associated with each rail being adjacent each other in a direction extending transversely to the track and each tamping unit comprising a pair of vibratory tamping tools reciprocable in a direction extending substantially parallel to the track, a vertically adjustable tamping tool carrier supporting the pair of tamping tools, a support frame, vertical guides connected to the support frame and vertically adjustably supporting the tamping tool carrier, the support frame of each field side tamping unit being supported on the support frame of the adjacent gage side tamping unit.

Abstract: A ballast tamping machine comprises a tamping head comprising pairs of vibratory tamping tools immersible in the ballast and reciprocable in the operating direction and opposite thereto for tamping ballast under the ties, a track lifting and lining unit preceding the tamping head in the operating direction, and a device for substantially uniformly distributing ballast. The device has an outlet associated with each tamping tool for discharging ballast at the associated tamping tool.

Abstract: A mobile track leveling, lining and tamping machine comprising a ballast tamping assembly mounted on an elongated machine frame and a track lifting and lining unit for correcting the position of the track, the unit being mounted on the machine frame adjacent the ballast tamping assembly and preceding the ballast tamping assembly in the operating direction, and the track lifting and lining unit comprising a two-part tool carrier frame extending in the direction of elongation of the machine frame, a first tool carrier frame part being arranged adjacent the ballast tamping assembly and rearwardly of a second tool carrier frame part in the operating direction, two pairs of flanged wheels supporting the tool carrier frame on the track rails, the two pairs of flanged wheels being rotatable about respective horizontal axes defining a plane and being spaced from each other to form a front pair and a rear pair of flanged wheels on the first tool carrier frame part in the direction of elongation of the machine frame an

Abstract: A ballast tamping unit for tamping ballast under two successive ties comprises a vertically adjustable tamping tool carrier and a set of two pairs of opposed vibratory and reciprocable tamping tools mounted on the tamping tool carrier, the pairs of tamping tools being so spaced from each other that two adjacent tamping tools of the pairs may be immersed in the crib between two successive ties and two remote tamping tools of the pairs may be immersed in respective cribs adjacent the successive ties.

Abstract: This invention relates to a tamping mechanism of a tie-tamping outfit used in road-building. The tamping mechanism of the tie-tamping outfit includes a casing mounting at least two vibrators rigidly linked with tamping tools. Each vibrator has at least one tubular spring having a space which communicates with a hydraulic source of vibration excitation. The invention can be used for compacting a railway bed during repair and laying of rail tracks.

Abstract: A mobile track tamping machine comprises a machine frame, undercarriages mounting the machine frame on a track, and a plurality of independently transversely and vertically adjustable tamping tool units aligned transversely to the track, each tamping tool unit comprising a pair of reciprocable vibratory tamping tools including tamping picks immersible in the ballast, drives for reciprocating the tamping tools in a direction extending substantially perpendicularly to the ties and for vibrating the tamping tools, and a drive for vertically adjusting the tamping tool unit. Respective transversely pivotal carrier frames for two of these tamping tool units are mounted on the machine frame, each carrier frame being pivotal about a vertical axis in a plane extending substantially parallel to the track, and an independent drive is connected to each carrier frame for pivoting the carrier frame.

Abstract: A mobile track leveling, lining and tamping machine comprises four ballast tamping units mounted between the undercarriages of the machine and immediately preceding the rear undercarriage in the operating direction. The ballast tamping units are mounted for independent transverse and vertical adjustment with respect to the machine frame by power drives, a respective one of the ballast tamping units being arranged at the gage side and the field side of each rail, and each ballast tamping unit comprising a pair of vibratory tamping tools reciprocable in the direction of the track and immersible in the ballast with a respective one of the ties positioned between the tamping tools.

Abstract: A universal mobile track leveling, lining and tamping machine useful for work in track switches and tangent track comprises four ballast tamping units mounted between the undercarriages of the machine and immediately preceding the rear undercarriage in the operating direction. The ballast tamping units are mounted for independent transverse and vertical adjustment with respect to the machine frame, a respective one of the ballast tamping units being arranged at the gage side and the field side of each rail, and each ballast tamping unit comprising a pair of vibratory tamping tools reciprocable in the direction of the track and immersible in the ballast with a respective one of the ties positioned between the tamping tools. Each unit is independently vertically adjustable on an independent vertical guide and independently transversely adjustable on at least one transverse guide.

Abstract: A mobile track working machine comprises a machine frame, operating tools adjustably mounted on the machine frame, drives for adjusting the operating tools into various operating positions and into an inoperative position with respect to the track rails, controls for the drives for adjusting the operating tools into the various operating positions and into the inoperative position, and an apparatus for automatically controlling the positions of the operating tools. The apparatus includes sensors for monitoring the transverse position of the track rails and obstacles along the track, generators for output signals indicating respective ones of the monitored transverse position of the track rails and of obstacles along the track, and transmitters for transmitting the output signals to the drive controls whereby the operating tools are adjusted into the respective positions in response to the output signals.

Abstract: A continuously advancing track surfacing machine for compacting a ballast bed comprises a power-actuated, vertically adjustable track stabilization assembly mounted on the machine frame between front and rear undercarriages supporting the machine frame on the track. The track stabilization assembly includes rail-engaging vibratory roller tools and a drive for pressing the roller tools into engagement with the facing gage sides of the track rails, and a track leveling reference system monitors the track level. A vertically adjustable plow arrangement for smoothing the ballast bed is mounted on the machine frame between the undercarriages and associated with the track stabilization assembly, the plow arrangement extending across the track at least from one of the tie ends to the opposite tie end.

Abstract: A method of working a main track and a laterally adjacent track in a track switch section in tandem comprises the steps of intermittently moving a track leveling, lining and tamping machine with lifting tools and vertically and laterally adjustable, vibratory tamping tools along a main track, lifting the main track under the control of a reference system with the lifting tools to a desired level at respective longer ties connecting the tracks, and tamping ballast under the lifted ties with the tamping tools. A switch leveling and tamping machine with lifting tools is moved along the laterally adjacent track and, in the same operating stage, at least one of the rails of the laterally adjacent track is lifted with the lifting tools of the switch leveling and tamping machine, and ballast is tamped under at least a portion of the longer ties at the laterally adjacent track. The ballast tamping is completed under any not previously tamped ties or portions of the longer ties in a subsequent operating stage.

Abstract: The machine comprises at least two pairs of vibrating tamping hammers, each igidly associated with a support oscillably pivoted to the frame of the machine and subject to the action of a fluidodynamic actuation jack comprising a first extendable section, adapted to move the hammer from a substantially vertical working position to a substantially horizontal lowered idle position, and a second section, fed by distribution mechanism with alternating cyclic operation, adapted to subject said first jack section and the related tamping hammer to a corresponding cyclic and alternating vibration.

Abstract: In a mobile machine for tamping ballast under ties of a railroad track, which comprises a machine frame, spaced undercarriages supporting the machine frame for mobility on the railroad track in an operating direction, and a ballast tamping assembly mounted on the machine frame and comprising a vertically adjustable tamping tool carrier, a drive for vertically adjusting the tamping tool carrier, pairs of vibratory and reciprocatory tamping tools immersible in the ballast upon vertical adjustment of the tamping tool carrier, and drives for vibrating and reciprocating the tamping tools, the invention provides a vertically adjustable device associated with the ballast tamping assembly for gripping and transversely positioning a respective one of the ties, and a drive for vertically adjusting the device. A vertically adjustable ballast broom device preferably precedes the tamping tool assembly for sweeping ballast off respective ones of the ties into an adjacent crib defined between successive ones of the ties.

Abstract: A continuously advancing machine for track leveling, lining and tamping comprises a main frame, a single undercarriage supporting the main frame and the main frame having a portion projecting in the track direction from the single undercarriage, a drive connected to the single undercarriage for continuously advancing the main frame in an operating direction, a brake connected to the single undercarriage for stopping the advancing main frame, and an operator's cab, a control arrangement and a power plant mounted on the continuously advancing main frame.

Abstract: Continuous ballast-tamping machine having a machine structure able to run with a straight, uniform motion along a railroad line and having a tamping structure connected thereto able to move lengthwise along the machine structure with a straight, alternating movement owing to the action of an actuation means. The tamping structure is adapted to consolidate ballast in correspondence with sleepers that bear the railway line. The tamping structure has a plurality of tamping heads each of which has a tine holder, and each tine holder is positionable vertically in an independent manner in relation to the railway line. Independent means are included for providing vibratory motion for each pair of tamping heads.

Abstract: A mobile switch leveling, lining and tamping machine comprises a vertically and laterally adjustable leveling and lining tool carrier frame linked to the machine frame, a pair of flanged wheels supporting the carrier frame on a main track for mobility therealong, each flanged wheel engaging a respective rail and serving as a track lining tool, a respective power-operated, vertically and transversely adjustable track lifting tool mounted on the carrier frame for gripping each rail at one side thereof, a leveling and lining reference system including a main track position sensing device, the leveling and lining reference system controlling actuation of the track lifting and lining drives in response to the main track position sensed by the device, a vertically adjustable auxiliary device mounted on the machine frame for lifting a laterally adjacent track section, a power-actuated drive for laterally displacing the auxiliary device, and a measuring carriage associated with the machine and running on the laterall

Abstract: A tamping pad includes cutout along the length of the leading edge thereof to support at least one wear-resistant insert rigidly positioned therein. The wear-resistant insert comprises a body having a first side and a second opposed side, first and second opposed major surfaces and first and second opposed shoulders. The first side of the insert body defines a tamping blade leading edge which is arcuate in shape between the opposed shoulders. The arcuate leading edge of the insert body has a radius which defines the length of the arcuate edge to be of a ratio of about 1.3 relative to the width of the carbide insert. Preferably, the plurality of inserts extends end to end along the length of the leading edge of the blade to define the interrupted leading edge of the tamping pad as formed by the curvilinear leading edge of each of the plurality of inserts.

Abstract: A machine for laterally displacing a track comprises at least one vertically adjustable tamping head having reciprocable vibratory tools for tamping ballast under the ties; a compact operating unit comprising a common carrier frame, a vertically and laterally adjustable device for lifting and laterally displacing the track mounted on the common carrier frame and including rail engaging roller tools, and a vertically and longitudinally adjustable device for orienting obliquely positioned ties to assume an orientation extending substantially perpendicularly to the track in the common plane, the tie orienting device being mounted on the common carrier frame and including a tie engaging tool; and power-actuated drives linking the carrier frame of the operating unit to the machine frame for vertically and laterally adjusting the carrier frame.

Abstract: There is described a track travelling railroad switch tamping machine which has a transversally extending guide frame at its front end and four ballast tamping units one each mounted in individual sub-frames which are mounted on the guide frame. Hydraulic power means are provided to individually move each of the sub-frames with its tamping unit, transversally of the vehicle on the guide frames, independentally of each other sub-frame. Individual hydraulic power devices are provided on each sub-frame for individually raising and lowering each tamping unit within its own sub-frame, independently of the other tamping units.

Abstract: In a mobile machine for tamping ballast under ties of a railroad track, which comprises a machine frame, spaced undercarriages supporting the machine frame for mobility on the railroad track in an operating direction, and a ballast tamping assembly mounted on the machine frame and comprising a vertically adjustable tamping tool carrier, a drive for vertically adjusting the tamping tool carrier, pairs of vibratory and reciprocatory tamping tools immersible in the ballast upon vertical adjustment of the tamping tool carrier, and drives for vibrating and reciprocating the tamping tools: a first device associated with the ballast tamping assembly for gripping and transversely positioning a respective one of the ties, the first device including a drive for vertically adjusting the device, and a second device operable independently of the first device for transversely displacing a respective one of the ties, the second device including a drive for vertically and transversely adjusting the second device.

Abstract: A mobile apparatus for sequentially exchanging selected consecutive groups of old ties for groups of new ties while retaining a groups of old ties between the selected old ties for support of the mobile apparatus on the railroad track, which apparatus comprises an elongated bridge-like work vehicle having two undercarriages supporting respective opposite ends of the work vehicle on the railroad track, and a succession of different individual devices mounted on the work vehicle between the undercarriages and operative to effectuate different sequential operations for exchanging the selected old ties for the new ties.

Abstract: A continuous action track maintenance or rehabilitation machine comprises a first machine frame, a carrier frame arranged between the undercarriages supporting the first machine frame on the track, ballast tamping and track lifting and lining units vertically adjustably mounted on the carrier frame, and a drive linking the carrier frame to the first machine frame for longitudinally displacing the carrier frame with respect thereto. A second machine frame is linked to the rear end of the first machine frame, and a plow arrangement is vertically adjustably mounted on the second machine frame between the undercarriages thereof, the plow arrangement comprising a drive connecting the plow arrangement to the second machine frame for vertically adjusting the plow arrangement with respect thereto, a center plow for plowing ballast between the rails of the track, shoulder plows for plowing ballast laterally adjacent each one of the rails, and a drive for operating each one of the plows.

Abstract: A combined tamper and compaction apparatus for use on a railroad track leveling machine utilizes hollow tamping tools which are inserted in loose ballast on either side of a cross tie. The tamping tools are vibrated to "fluidize" the ballast and plungers mounted within the tamping tools force the ballast therein downwardly and outwardly beneath the ties. Thereafter the tamping tools with plungers extended are raised and lowered to compact the ballast.

Abstract: A mobile machine for leveling, lining and tamping a track switch comprises a machine frame and a track lifting and lining tool carrier frame mounting a pair of flanged lining rollers arranged for supporting the carrier frame on the rails of the main track and for lining engagement with the main track rails, lifting tools including a respective vertically and laterally adjustable clamping element arranged for clamping engagement with the main track rails, and lifting and lining power drives connecting the carrier frame to the machine frame for vertically and laterally adjusting the carrier frame with respect to the machine frame. The machine has a branch track lifting device comprising a laterally adjustable carrier frame, flanged rollers arranged for supporting the carrier frame on one of the rails of the branch track, and a laterally adjustable clamping element including at least one lifting roller arranged on the carrier frame for clamping engagement with the one branch track rail.

Abstract: A mobile apparatus for sequentially exchanging selected consecutive groups of old ties in an existing railroad track for groups of new ties while retaining groups of old ties therebetween to support the mobile apparatus on the track, which comprises a continuously advancing bridge-like work vehicle having a machine frame defining an upwardly recessed portion between respective ends thereof and a respective swivel truck supporting each machine frame end. A continuous guide track is mounted atop the work vehicle and a power-driven tie transporting crane is mounted for mobility on the guide track.

Abstract: A track leveling and ballast tamping machine comprises a standard vehicle capable of being coupled to a train, two undercarriages supporting the frame for movement in an operating direction along a track and a drive for moving the frame along the track. A ballast tamping unit is connected to the frame between the undercarriages and a track lifting unit is connected to the frame between the undercarriages ahead of the ballast tamping unit in the operating direction, a track leveling reference system controlling the lifting of the track by the track lifting unit. A ballast receiving and storage container is mounted on the frame ahead of the ballast tamping and track lifting units in a forward portion thereof, the container having adjustable outlet ports for distributing ballast in respective ones of the cribs, and a ballast conveyor is arranged on the frame for conveying ballast to the ballast receiving and storage container in the forward portion of the frame, in the operating direction.

Abstract: A mobile track renewal installation for the continuous replacement of the rails and ties of a track comprises a leading and a trailing work vehicle arranged for continuous advancement on a track in an operating direction. The leading work vehicle bridges an intermediate renewal section where an existing track is replaced by a new track and carries a ballast excavating and planing apparatus for removing ballast from the ballast bed and planing the remaining ballast bed, and an apparatus for laying ties on the planed ballast immediately behind the ballast excavating and planing apparatus, in the operating direction. The trailing work vehicle carries apparatus for fastening rails to the laid ties and an operating unit for lifting the track and for tamping the ballast under the ties trailing the apparatus for fastening the rails to the laid ties, the operating unit being intermittently displaceable on the trailing vehicle in the operating direction.

Abstract: A production tamper for selectively tamping ballast simultaneously underneath two successive ties or underneath a single tie with a tamping head comprising a common tamping tool carrier, two pairs of opposed vibratory tamping tools mounted on the common tamping tool carrier laterally adjacent the sides of a rail, the pairs of tools being spaced from each other in the direction of elongation of the track so that the adjacent tools of the two pairs may be immersed in a respective crib defined between adjacent ties, and the transversely aligned remote tamping tools of at least one of the pairs being adjustable independently from the other tamping tools for movement between a lowered operative and a raised inoperative position. An adjustment drive is connected to each adjustable remote tamping tool for moving the same, reciprocating drives are connected to the opposed tamping tools, a common drive vibrates the tamping tools, and a drive is provided for vertically adjusting the tamping tool carrier.

Abstract: Apparatus for detecting at least one metallic object in a series of metallic objects lying along a path in a repetitive pattern by a metallic detector mounted on a vehicle movable along the path with the movement of the vehicle controlled by the detector to position the vehicle over a detected metallic object and blocking detection of a previously detected object subsequent to the detection of the previously detected metallic object to prevent erroneous metallic object detections, and further controlled to initiate different travel modes of movement including a fast mode to move the vehicle in a forward direction along the path at an optimum speed and controlling deceleration of the vehicle for accurately positioning it at a detected one of the metallic objects. The apparatus has particular application to the tamping of crossties on railway tracks and includes programs for controlling the movement of the vehicle and the tamping operation.

Abstract: The tamping machine is provided with tamping units on which each tamping tool (8) is articulated on a junction lever (26) controlled for work pivoting by a piston-cylinder unit (28) connected to a forced oscillation generator (24).The tamping tool (8) can be lifted into out-of-use position on the junction lever (26) by means of an intermediate lever (30) driven by a second hydraulic piston-cylinder unit (31), this intermediate lever being connected to said tool by a connecting link (36). In the lowered working position, the articulation (29) of the intermediate lever and the two articulations (34, 35) of the connecting link are aligned and the piston-cylinder unit (31) for the driving of the intermediate lever is abutted at the end of its stroke. As a result, the tamping tool (8) constitutes the equivalent of a rigid tool with respect to the transmission of the tamping and forced-oscillation forces.

Abstract: The tamping machine is equipped with tool holders (7) on which each of the two tools (8) of a pair of tamping tools is connected by a cylinder-piston unit (28), via an eccentric arm (25, 25'), to one of the two eccentrics (24, 24') of the output shaft (33) of a forced oscillation generator. Each of the two eccentric arms (25, 25') has, in addition to its articulation to one of the two eccentrics, a second articulation connected directly to a hydraulic cylinder-piston unit (28) and a third articulation (29) connected by a connecting link (30) to a pivot (31) fastened on the tool holder, said last connection having the purpose of immobilizing the two eccentric arms in rotation around the eccentric shaft (33). This transmission of movements, designed to facilitate the maintenance of the hydraulic cylinder-piston units (28), is also shown applied to two and three pairs of tamping tools juxtaposed in the same plane.

Abstract: The present invention relates to a continuously advancing machine for works on a railway track, comprising a main chassis mounted on bogies and provided with a mobile chassis supported working members such as ballast tamping and track lifting/shifting units. The chassis may move along the main chassis under the action of a chain driven by a motor so as to advance, during the works, step by step with respect to the track while the machine progresses continuously. The reactions of inertia are compensated by a mobile counterweight coupled to the chain so as to execute movements parallel to those of the mobile chassis but in opposite direction, the respective quantities of movement of the counterweight and of the mobile chassis including the working members being equal and opposite.

Abstract: A track working machine comprising a frame mounted for mobility on the track, an operating unit mounted on the frame, the operating unit including tools for working on the track and a drive for moving the machine along the track in an operating direction, and an operator's stand including a seat for the operator and a control panel and actuating element for the drive associated with the seat for operation by the operator, the operator's stand with the seat and drive actuating element being pivotal about a vertical axis between two end positions in the operating direction and in a direction opposite to the operating direction, respectively, in relation to the frame and the operating unit, and being blocked in each one of the end positions.

Abstract: A mobile track leveling, lining and tamping machine has a main frame supported on undercarriages for mobility on the track in an operating direction, a drive for propelling the main frame in the operating direction, a carrier frame trailing the main frame in the operating direction, a single support and guide carriage supporting and guiding the carrier frame at a rear end thereof in the operating direction and spaced from one of the undercarriages of the main frame in the direction of the track, a tamping unit mounted on the carrier frame between the one undercarriage and the support and guide carriage, the tamping unit immediately preceding the support and guide carriage in the operating direction, a track leveling and lining unit preceding the tamping unit in the operating direction, a pivotal connection pivotally supporting a front end of the carrier frame on the main frame, and an adjustment drive at the pivotal connection for adjusting the position of the carrier frame in relation to the main frame in th

Abstract: A continuously advancing track leveling, lining and tamping machine comprises a heavy main frame supported on two spaced apart undercarriages for continuous movement in an operating direction and a power plant, drives and operating controls as well as an operator's cab for operating the drives and controls mounted on the main frame. Two separate carrier frames are arranged between the two undercarriages of the heavy main frame, and a drive connected to the heavy main frame longitudinally displaces the carrier frames in relation to the main frame whereby the carrier frames may be intermittently advanced during the continuous movement of the heavy main frame, this drive having a displacement path corresponding to a distance between at least two successive ties.

Abstract: A mobile track leveling, lining and tamping machine comprising a main machine frame supported on undercarriages spaced apart in the direction of the track for mobility on the track in an operating direction, the track consisting of two rails fastened to successive ties resting on ballast; an operating unit comprised of a separate carrier frame supporting a ballast tamping assembly and a track leveling and lining assembly forwardly of the ballast tamping assembly, in the operating direction; a pivotal bearing supporting a front end of the operating unit on the machine frame; and a track stabilization assembly mounted on the main machine frame between the operating unit and a succeeding one of the undercarriages supporting the main machine frame on the track.

Abstract: The invention relates to a continuously advancing machine for works on a railway track, comprising a main chassis mounted on bogies and provided with a mobile auxiliary chassis supporting working members such as ballast tamping and track lifting/shifting units. The auxiliary chassis may move along the main chassis under the action of a bar for attachment to a chain driven by a motor and borne by a carriage, so as to advance, during the works, step by step with respect to the track while the machine progresses continuously. The reactions of inertia are entirely taken up by the track, via the carriage immobilized thereon thanks to grippers during the phases of advance of the auxiliary chassis and its working units.

Abstract: A mobile machine for leveling, lining and tamping a track has a heavy main frame supported on undercarriages for continuous movement in an operating direction, a power plant, a drive for continuously advancing the main frame along the track in the operating direction and a brake for stopping the advance of the main frame, the power plant, the drive and the brake carried by the main frame, and a lighter subframe pivotally and longitudinally adjustably connected to the heavy main frame. Tamping heads are mounted on the subframe for tamping ballast in intermittent tamping cycles under respective the ties at points of intersection of the two rails and the ties.

Abstract: A mobile machine for leveling, lining and tamping a track has a main frame supported on undercarriages for continuous movement in an operating direction, a power plant and operating controls carried by the main frame, and an elongated subframe pivotally and longitudinally adjustably connected to the main frame, the subframe having two ends and being arranged ahead of one of the undercarriages supporting the main frame, respective undercarriages supporting the subframe ends. Tamping heads are mounted on the subframe between the respective undercarriages for tamping ballast in intermittent tamping cycles under respective ties at points of intersection of the two rails and the respective ties. A track lifting and lining unit is associated with the two rails mounted on the subframe ahead of the tamping heads and arranged on the subframe between the respective undercarriages.

Abstract: A continuously advancing machine for leveling, lining and tamping a track has a machine frame supported on undercarriages for continuous movement in an operating direction, a power plant and operating controls carried by the machine frame, and a tool carrier frame having a rear end supported on an undercarriage. A tamping tool assembly associated with each rail is mounted on the tool carrier frame immediately ahead of the undercarriage supporting the rear tool carrier frame end for tamping ballast in intermittent tamping cycles under the ties at points of intersection of the two rails and the ties. Each tamping tool assembly is vertically movably mounted on the tool carrier frame and includes two pairs of vibratory and reciprocatory tamping tools spaced from each other in the operating direction so that each pair of tools is in vertical alignment with a respective one of two successive cribs.

Abstract: A mobile machine for leveling, lining and tamping a track, which comprises a heavy main frame supported on two undercarriages spaced apart for continuous movement in an operating direction, a drive for continuously advancing the main frame along the track in the operating direction, an operator's cab, a power plant and operating controls on the main frame, a lighter subframe leading one of the undercarriages in the operating direction, tamping heads mounted on the subframe for tamping ballast in intermittent tamping cycles under respective ties at points of intersection of the two track rails and the respective ties, a tract lifting and lining unit associated with the two rails mounted on the subframe ahead of the tamping heads in the operating direction, the subframe and the tamping heads and track lifting and lining unit mounted thereon constituting an operating unit and the tamping, lifting and lining unit is arranged within sight of the operator's cab, and a drive connecting the lighter subframe to the he

Abstract: A mobile track leveling, lining and tamping machine has a machine frame supported on undercarriages for continuous movement in an operating direction, a power plant and operating controls carried by the machine frame, a tool carrier frame having a front end and a rear end, and an undercarriage supporting and guiding the tool carrier frame rear end on the track. Tamping tool assemblies are mounted on the tool carrier frame immediately ahead of the undercarriage supporting and guiding the tool carrier frame rear end for tamping ballast in intermittent tamping cycles under respective ties at points of intersection of the two rails and the ties in tangent and switch track sections and a track lifting and lining unit is associated with the two rails mounted on the tool carrier frame ahead of the tamping tool assemblies and is arranged on the tool carrier frame between two undercarriages spaced in the direction of the track for lifting and lining the track in tangent and switch track sections.

Abstract: A mobile track switch leveling, lining and tamping machine comprises an elongated machine frame, two undercarriages spaced apart in the direction of elongation of the machine frame and supporting the machine frame for mobility on the track in an operating direction, and a respective carrier frame associated with each one of the track rails between the two undercarriages. Each carrier frame supports a tamping tool unit comprising tamping tools capable of tamping the ballast in a track switch, and a track leveling and lining unit comprising tools for lifting and laterally moving the track, the tools being capable of engaging the associated track rail in the track switch, the track leveling and lining unit preceding the tamping tool unit in the operating direction.

Abstract: A tamper has tamping tools intended for tamping the open track and the switch gear. Each tool is mounted on an oscillating and pivoting lever (6) and has a fixed pick (20) and a pick (21) displaceable by pivoting in a plane transverse to the track around a shaft (23) which is rigidly connected to the lever (6) and by means of a cylinder (26). The tappets (22) of these picks are offset and partially cover one another in the close-together position and the picks are arched towards the outside so as to leave sufficient space between them for the flow of the ballast above the tappets. The switch gear is tamped in close-together position of the tappets over a reduced length (R) and the open track is tamped in spaced position over a greater length, the stroke of the cylinder (26) limiting and defining these two positions.