I thought I was beginning to understand this stuff until I read:
http://www.physorg.com/news163738003.html
What (I think) they're saying in this article, is that there is a situation where the train could actually have been been going for a 100 years whilst the earthbound folk, (albeit, now in orbit - so not earthbound), experience the train's trip as only one week ! (ie: the opposite of the 'classical twins' paradox).
So with a few changes to the original conditions, I think the train needs a 100 years worth of fuel (?).
Cheers