The method by Yola and Nexus is not good because it would need wheels to support the bottom of it, so it can rest on wheels. This is not possible because you cannot rotate tires. This is one thing I've been wanting for quite a while, and is possible if badspot would actually do some work on vehicle physics, if he hasn't already. I do know that he is working on the next update, so I cannot actually say he is doing nothing. If sideways tires were added, then we'd have opportunities such as trains, which is the point of this topic.
If we EVER get sideways tires, you will see my train with tracks that work for turning. :)