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Interesting. That sentence about derailing is quite mysterious. Maybe it's just stating the obvious that if a train derails in a tunnel, it would derail into what was originally a trench. There would almost certainly be some kind of gutter alongside the track. A trench/cut would need a side support wall or anchoring.
I wouldn't be surprised if it was both "trench" and "trough" at timescos i have a sentence where they are worried that a derailed train would fall into a tråg (trench) and another one where they use tie back anchoring for a "tråg" (trough)