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: 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 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 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.

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 ballst. 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.

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: 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 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 the renewal of sleepers of a track having rails and for the cleaning of exposed ballast after removal of old sleepers, includes a machine frame which is movable on a rail bogie on the track, a screening plant and a clearing device having a collection device for collecting ballast. A sleeper transport device includes a sleeper gripper, rotatable about a vertical axis, between two end-positioned rail bogies, connected to the machine frame, and being displaceable in a longitudinal direction of the machine. The sleeper transport device is displaceable from a front end position (with respect to a working direction) provided for picking up new sleepers by the collection device for collecting ballast, to a rear end position configured to deposit the new sleepers.

Abstract: A machine for the renewal of sleepers of a track having rails and for the cleaning of exposed ballast after removal of old sleepers, includes a machine frame which is movable on a rail bogie on the track, a screening plant and a clearing device having a collection device for collecting ballast. A sleeper transport device includes a sleeper gripper, rotatable about a vertical axis, between two end-positioned rail bogies, connected to the machine frame, and being displaceable in a longitudinal direction of the machine. The sleeper transport device is displaceable from a front end position (with respect to a working direction) provided for picking up new sleepers by the collection device for collecting ballast, to a rear end position configured to deposit the new sleepers.

Abstract: A machine for renovating a track includes the following: a transverse chain segment of an excavating chain is designed shorter than a crosstie length of new crossties. A ballast plow is disposed relative to a longitudinal machine axis between the transverse chain segment of the excavating chain and the device for placing the new crossties. A width—extending normal to the longitudinal machine axis—of the ballast plow is designed greater than the crosstie length of the new crossties.

Abstract: A machine for renovating a track includes the following: a transverse chain segment of an excavating chain is designed shorter than a crosstie length of new crossties. A ballast plow is disposed relative to a longitudinal machine axis between the transverse chain segment of the excavating chain and the device for placing the new crossties. A width—extending normal to the longitudinal machine axis—of the ballast plow is designed greater than the crosstie length of the new crossties.

Abstract: A machine for renovating a track has a machine frame made of a main frame and an auxiliary frame connected by a hinge to the main frame at its front end. The main frame is connected at the end thereof to a multi-axis railway chassis, and to a tracked chassis in the area of a front end thereof. The auxiliary frame is supported by a railway chassis on the track at a front end at a distance from the hinge.

Abstract: The invention relates to a gantry crane of a machine, for the exchange of sleepers on a track, which may be displaced in a machine longitudinal direction on crane tracks. Two crane buggies on the gantry crane, at a separation from each other in the machine transverse direction are embodied such as to be displaced relative to the crane chassis by means of a displacement drive for altering the gauge. The corresponding crane tracks may be adjusted in the track transverse direction by drives to change the gauge.

Abstract: The invention relates to a device for the disassembly of a rail anchor, connecting a rail to a sleeper of a track, comprising two opposing tool levers, connected by a rod, operated with displacement about a pivot axis by means of a press drive. A first tool lever is connected to the press drive, coupled to the tool frame. A further tool lever is defined at an upper end by the pivot axis.

Abstract: A measuring vehicle (V) allows the geometric condition of a railway track to be measured in relation to its theoretical configuration. In comprises a rigid chassis (9) making up the measuring base, supported by runners (10, 11,12) and a probing device (13, 14, 15) which takes the bearings of the geometric configuration. The probing device allows the degradation of the geometric configuration found to be determined. The chassis (9) is provided with opto-electronic means (21, 22, 23, 24, N) laid out to measure the elastic degradation of the chassis (9) while travelling on the track (R). The values for deformation of the chassis (9) are passed to the probing device to correct the values of the geometric configuration found.