Abstract: A track building machine (34) for the renewal of tracks, essentially comprising a machine frame (1), supported on rail mountings (2, 3), having a work aggregate (38) exhibiting devices (5, 6, 7) for preparing a ballast bed, for lifting out old ties (8) and for laying new ties (9), and additionally comprising devices (35, 36, 10, 11, 12) for transporting the old and new ties (8, 9) and for raising, guiding and stretching apart old rails (13). For the support of the rail mounting (3) in working deployment, which rail mounting is disposed directly in front of the work aggregate (38) in the direction of working, a slide mechanism (18) is provided, which is rollable on the old ties (8). The work aggregate (38) for lifting out the old and laying the new ties (8, 9), outside a section limited by the rail mountings (2, 3) connected to the machine frame (1), is fastened on an extension arm (4) prolonging the machine frame (1).

Abstract: The invention comprises essentially a first car (1) resting on a bogey running on the track to be replaced, and a second bogey (3) moving during the work cycles with the aid of two auxiliary devices (5, 6) above the old cross-ties (4) without rails. It also comprises a work unit for removing the old rails, a unit (8) for the old cross-ties (4) and a unit (10) for laying new cross-ties (2). The auxiliary devices (5, 6) are two retractable translation devices arranged so as to be able to move on the cross-ties (4) without rails and are disposed on either side of the second bogey (3).

Abstract: A method and apparatus for converting a railway-track renewal train into a train for laying new railway track. The railway-track renewal train includes a first truck bearing on a bogie rolling on a renewed track, a second truck bearing on spaced first and second bogies of which the first bogie rolls on an old track and the second bogie moves on old ties or sleepers, and various means for removing the old rails and sleepers and for laying new rails and sleepers. The bogie of the first truck is mounted onto a vehicle designed to remain on site and having a motor for moving the vehicle on the ballast or platform. The vehicle is moved in the direction of movement of the renewal train or in the opposite direction dependent on whether an old railway track is removed or new track is laid.

Abstract: A tie lifting machine comprises a reciprocating tie removing member provided with retractable push fingers for removing the ties from the ballast and pushing them onto an upwardly inclined ramp to an intermediate position, a fork-like tie lifting member adapted to lift the ties from the intermediate position up to a belt conveyor running in the direction of travel of the machine, and a tie pusher adapted, when the tie lifting member is in its upper position, to transfer the ties carried by this member to the belt conveyor.