Currently we’re not having a limit for the train length. But it seams so that we’re going to include it. Infinite trains disturb the game mechanics and could break the experience. The train stations aren’t expendable in length, so a train does take up some time to load/unload if it’s longer than usual.
I’m personally annoyed about the disasters in tycoon games, but they’re a part of it.
Trains will not pass through each other.