Is it possible for the stations to be coded and change the active line of a train? I have set up a way that codes the output of the old line to a new line but don't know how or if their is a way to have the circuit change the active line of a train.

There isn't, but it's definitely an interesting idea. I think currently you could kind of merge all your lines into one and then have circuitry tell the train to go to a certain station and it would do something similar. Probably messy, but might work.

I might add it in, once Space Age is out and I finished updating my other mods.