I've made passenger/frieght cars just by carving and stacking sheet cakes (about 5"x8" or whatever).
http://www.cakecentral.com/cake-photo_1342829.html
I did that one a few years ago - you should warn the mom ALL the kids wanted a piece of Thomas and I ended up with a LOT of cake left over. :-/ These trains are so much fun, though.
I made train cars, cutting a sheet cake into the needed sizes, as I was making a circus train, I made royal icing bars, to keep the wild animals in, which I modeled with choco paste. I put the entire train on a board, made train tracks, with craft gun, the ties I made out of fondant. I used cookies cumbs between the ties and along the tracks, added so grass to the cake board and was done.
I made a train last year for a baby shower with an engine and 2 cars. I believe for all of them I just made them in loaf pans and then cut as needed. For the engine I cut a bit of the back off and put it up top (for the conductor to sit LOL) and then also baked some cake in a soup can for the front of the engine. Hope that helps.
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