Laying railroad cable troughs.
I guess these are for various control/sensor cables? I've never seen this before, but at first glance it does appear to be quite an elaborate setup for laying troughs.
Previously:
wartime railway and train sabotage techniques
railway construction machine GIF
Janney semi-automatic railway coupler - GIF and patent
Automatic train washing system - GIF
Richard Feynman explains: What keeps a train on the track?
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