[He's read a bit about the end of life voidcraft, and noted that it does seem to mostly be applied to those with terminal illnesses and similar circumstances.]

So as long as they still had a living body or functional vessel back on their home world, it could work?

Since copies of our bodies should still be on our home worlds, what would theoretically happen if they were destroyed while we were still tethered to the train? Would we be unable to return home?