| 摘要 |
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.
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