For a long time, the few things that could easily move around heavy machinery was trains. So lets say that there’s a train on a track, and its broken down and it either needs repairs, extra parts, or a replacement engine. Right behind it are several other trains, because this is a busy line.
How does a train bringing repair or extra engines deal with this? Its not like they can go right up to the broken down train because there’s other trains in the way. How do they get rid of the broken engine and the other carriages, because they’re on top of the tracks, and there’s no other tracks for them to move onto.
In: Engineering
If the train cannot be fixed in place, a rescue train can come from the front, as you said behind the broken down train, other trains might be stuck, but the line is clear ahead and the train can either be put on a trailer with a crane, rerailed and pulled back to a depot otherwise
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