Abstract: In order to fix a rail of a rail track using a rail machine, the rail machine is moved in a working direction so that at all times a portion of the rail which is not attached to a cross-member of the rail track passes through a thermal conditioning zone of a thermal conditioning device of the rail machine, a temperature of a surface region of the portion of the rail passing through the thermal conditioning zone is modified using the thermal conditioning device by generating a non-homogeneous temperature distribution in the portion of the rail, and the portion of the rail is fixed to a cross-member of the rail track, after modification of the temperature of the surface region of the portion of the rail, without waiting for the temperature distribution in the portion of the rail to be homogenized.

Abstract: The invention relates to a mechanism (130) for moving stacks (21?, 22?) of sleepers (21, 22) intended to equip a railway track, the displacement mechanism (130) being intended to equip at least two successive work wagons (100, 200, 300) of a railway vehicle (1), the displacement mechanism (130) comprising guide means (140) configured to guide, along a longitudinal direction (X) of each of the wagons, a plurality of adjacent carriages (131) in pairs, the displacement mechanism (130) comprising drive means (150) for moving the carriages (131) together reciprocally between a first and a second travel position, so that each carriage (131) carries a stack (21?, 22?) of sleepers (21, 22) following a forward path (W1) from the first to the second travel position and configured to travel a return path (W2) from the second to the first travel position while being unloaded.

Abstract: A device for securing a railway apparatus, comprising a support platform and a mechanism for securing the apparatus on the platform, the securing mechanism comprising:—at least one guiding slide extending in a longitudinal direction, supported by the support platform; and—a member for attaching the apparatus to the platform capable of moving along the guiding slide. The securing mechanism also comprises an upper beam supporting the guiding slide and a lower beam, connected by means of a connecting member so as to be movable in a direction perpendicular to the longitudinal direction of the guiding slide. Moreover, the securing mechanism comprises locking mechanism configured to prevent the movement of the upper beam with respect to the lower beam in said perpendicular direction.

Abstract: The invention relates to an excavating finger of a bucket that is designed to be fitted to an excavating chain for a device for excavating ballast beneath a railroad track, the finger being in one piece and comprising: a retention portion that is rotationally symmetric about a reference axis of the finger, the retention portion being designed to be accommodated in a cylindrical cavity of the bucket; and a tip designed to project out of the cylindrical cavity of the bucket, the excavating finger (132) wherein the retention portion comprises at least one annular channel that is configured to receive at least part of an immobilizing rod, designed to provide axial retention of the retention portion in the cylindrical cavity in such a way that the finger is free to rotate about its reference axis.

Abstract: Disclosed is a method for renewing old rails of a railway track in which, during a first phase, new long rails are unloaded along the railway track from a set of transport wagons of a work train travelling in a first direction of travel and, during a second phase, the work train travels in a second direction of travel opposite the first direction of travel, the new long rails being placed on then fastened to a fixed structure of the railway track during the second phase; and a work train designed to implement the method for renewing old rails.

Abstract: Disclosed is an initial method for laying new long rails of a railway track by means of a work train travelling in a direction of travel, the initial method being intended to be implemented during a process for replacing old rails of the railway track, said method including a phase during which the new long rails are laid and subsequently fastened to sleepers of the railway track when the work train is travelling in said direction of travel, the initial laying method including a step of laying at least one portion of a first of the new long rails on the sleepers at least one end of an old joining rail.

Abstract: A link for an excavating chain for a ballast excavating device below a railroad track, the link comprising a body extending longitudinally between a front end and a rear end and being crossed by at least one front through-hole and a rear through-hole configured to receive hinge means with an adjacent link of the chain, the front and rear through-holes extending along axes parallel to each other and contained in a reference plane of the body, the link further comprising, on an inner side of the body with respect to the reference plane opposite to the outer side, a concave guide surface extending over an envelope having an axis generator parallel to the axes of the link joints, the guide surface being configured to at least locally match a curvature of a return member of the excavating device.

Abstract: Disclosed is an articulated assembly of two links for a ballast removal chain, a first of the two links comprising a single-piece member having two flanges which are parallel to one another and each of which has a through-hole, a second of the two links comprising a single-piece member comprising a guide flange that is inserted between the two parallel flanges of the first link, the guide flange being penetrated by a guide hole, the articulated assembly further comprising a hinge pin that is inserted into the guide hole and the through-hole in each of the two parallel flanges. The guide hole is reinforced by a bushing designed to receive the hinge pin and rotatingly guide the hinge pin relative to the single-piece member of the second link. The through-hole in one of the two parallel flanges comprises a flat portion cooperating with a flat section of the hinge pin so as to prevent the hinge pin from rotating relative to the single-piece member of the first link.

Abstract: A railway works machine comprises a machine chassis and a works shuttle, the machine chassis having two opposite longitudinal end portions and a middle portion connecting the opposite longitudinal end portions, a volume being created underneath the middle portion of the machine chassis to house at least part of the works shuttle. The shuttle chassis is able to move with respect to the machine chassis back and forth between two end-of-travel positions. A longitudinal locking system allows the machine chassis to be secured to the shuttle chassis in a position for travel. The longitudinal locking system comprises a first locking device locking together a first of the two longitudinal end portions and the shuttle chassis and a second locking device locking together the shuttle chassis and a second of the two longitudinal end portions.

Abstract: A tamping machine for a works train for laying, repairing or replacing a rail track has a first truck and a second truck that are situated longitudinally at a distance from one another, a machine frame and a tamping shuttle, the tamping shuttle having a shuttle frame and one or more tamping units that are vertically movable with respect to the shuttle frame, the shuttle frame being linked to the machine frame by longitudinal guide means that allow a relative back-and-forth movement, between two end-of-travel positions, between the shuttle frame and the machine frame in a longitudinal direction of the tamping machine. The machine frame is entirely supported by the shuttle frame, which is carried by the first truck (20) and the second truck.

Abstract: In order to control a measuring system with a tacheometer mounted on a carrier trolley circulating on a railway track under construction and a target fastened to a railway construction machine, the carrier trolley is circulated on the railway track in a working direction from a starting position to an arrival position in the vicinity of a topographic arrival singularity. The carrier trolley is immobilized and an observation of the topographic arrival singularity is made. Then, with the railway construction machine having been brought into the starting position, an observation of the target is made. Finally, the coordinates of the arrival position of the carrier trolley are calculated as a function of the measurements made, of additional data relating to the starting position, and of positioning data of the topographic arrival singularity and data relating to a theoretical line of the track.

Abstract: A system (10) for sieving ballast comprises a first sieve (26) and a second sieve (28) which is located behind the first sieve (26) in a first direction (100). A discharge collection conveyor (32.1) is located directly under a first discarded ballast outlet (42) of the first sieve (26) in order to collect a flow of discarded ballast which comes from the first sieve (26) and to convey it in a second direction (200) counter to the first direction (100). A rerouting collection conveyor directly collects the flow being discharged from a clean ballast outlet of the second sieve in order to convey it in the first direction (100). The rerouting collection conveyor extends under the first sieve (26) at a lower height than the discharge collection conveyor.

Abstract: A work train lays a rail of a railway track. The work train has a heating device with a heating zone, gas burners, and a radiant body interposed between the gas burners and the heating zone. The radiant body has openings that open into the heating zone. The work train is moved in a laying direction, so that at each moment a portion of the rail to be fixed passes through the heating zone. Heat is supplied to the rail to be fixed through the heating zone by feeding the gas burner so that no flame emerges from the openings in the heating zone and that at least 75% of the heat supplied to the rail is transmitted by radiation from the radiant body. Then the rail is fixed after the heat has been applied to a tie of the railway track behind the heating zone in the laying direction.

Abstract: In order to locate points or lines of interest (A, B, C, D, A?, B?, C?, D?, 162, 163, 164) of a railway track (22), by means of a railway locating system (12), progressing on the railway track (22), a linear camera (26) pointing at the railway track (22) repeatedly acquires instantaneous linear optical data along an instantaneous measurement line (50), and an orientation device (52) of the railway locating system (12) repeatedly acquires orientation data of the railway locating system (12) with respect to a reference line (22A) of the railway track (22).

Abstract: In order to position a set of one or more tools supported by a railway intervention vehicle progressing on a railway track, data is received characterising a curvilinear abscissa of a spatial indexation marker, a positioning of the spatial indexation marker with respect to a reference line of the railway track, and coordinates of points or lines of interest in a two-dimensional reference system. Transposition matrix cameras acquire transposition bitmap images in a spatial reference system of the transposition system. An odometer acquires progression data of the transposition system. Then the spatial indexation marker is identified as a function of the progression data and curvilinear abscissa data, to determine data characteristic of the spatial indexation marker and the reference line in the spatial reference system of the transposition chassis, and to calculate transposed coordinates of the points or lines of interest.

Abstract: In a method for renewing sleepers of a track formed of rails and the sleepers, the placement of skids, which support a machine frame of a track-building machine on the sleepers, is preceded by the machine frame being intermediately supported on the sleepers. The two rails are then distanced from one another, while avoiding a breakage separation, in a track section that includes both the region of the skids and the intermediate support. After supporting the machine frame on the skids, the intermediate support is lifted off the sleepers and work is begun.

Abstract: A system for securing a railway apparatus includes a support platform and a mechanism for securing the railway apparatus to the support platform, capable of switching from an unlocked state to a locked state. The securing mechanism has a guide rail, a trolley guided by the guide rail along a path which, when the support platform is in the loading position, is parallel to a reference plane, a device for immobilizing the trolley relative to the guide rail, an attachment member for attaching the railway apparatus secured to the trolley; and locking members for locking the guide rail relative to the support platform, which switch from an unlocked position to a locked position when the securing mechanism switches from the unlocked state to the locked state in the loading position of the platform, by urging the guide rail downwards relative to the support platform.

Abstract: A tamping machine includes at least one first tamping unit with first tamping tools and a first hydraulic motor provided with a first drive shaft driving the first tamping tools so as to generate tamping movements, and a second tamping unit adjacent the first tamping unit with second tamping tools and a second hydraulic motor provided with a second drive shaft driving the second tamping tools so as to generate tamping movements. The first hydraulic motor and the second hydraulic motor are supplied with power by a common synchronized hydraulic power supply system.

Abstract: A railroad renewal method includes, in particular: the removal of the old rail, the installation of the new rail and the primary adjustment of the temperature of the new rail to a set value at a point located upstream of and close to the attachment area on a crosstie. The thermodynamic behavior of the intermediate section of the new rail located between the primary temperature adjustment point and the attachment area is controlled by way of a device, provided with a control and management system, such that the temperature of the new rail is uniform, in the cross-section thereof, at a set value on the attachment point.

Abstract: A machine for repairing a ballast bed has an undercutter that defines a direction of movement of the repairing machine, and a distributor for dividing a flow of ballast entering from the undercutter into a rear flow of exiting ballast and a separate front flow of exiting ballast. At least one rear screening machine is positioned behind the undercutter in the direction of movement and is fed by the rear flow of exiting ballast. At least one front screening machine is positioned in front of the undercutter and fed by the front flow of exiting ballast, and the distributor has a variator for varying the ratio between the separate first and the second flows of exiting ballast.