Issue description
When a train is running on a track (without issue), and a portion of track that the train is currently on collapses, the train disappears and must be rebuilt
Reproduction steps
Have working train
While the train is in the same stretch of track (not like on it, but the same span between entities), a digging project of some sort must degrade the track to the point where it collapses.
Game version and build number
v0.8.4b b593
Operating system
Windows