| 摘要 |
A mobile arrangement for improving a track bed by interposing a layer of sand between the subgrade and ballast comprises a first self-propelled vehicle including a frame, a hoist mounted on the frame for lifting an assembled track section off the track whereby a trackless renewal section is created and a conveyor and discharge and distributing chute for ballast and sand, the vehicle frame having a length bridging the trackless renewal section and respective track sections adjoining the trackless renewal section at respective ends thereof in the regions of the vehicle frame ends. A second self-propelled vehicle includes a frame whose one end faces one end of the frame of the first vehicle in one of the adjoining track sections, a ballast excavating chain and a conveyor for the excavated ballast. A respective triple-undercarriage arrangement supports the one end of each vehicle frame, each triple-undercarriage arrangement consisting of two on-track undercarriages and an off-track undercarriage. Another undercarriage supports the frame of the first vehicle and the distance between the triple-undercarriage arrangement and the other undercarriage supporting the first vehicle frame exceeds the length of the assembled track section.
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