I manually searched for this one as I do strange things sometimes, but I couldn't find it.
The suggestion/question: Could you add either a way to be inside of the cab in the train or have maybe a caboose that someone could ride in? I would love to be able to have a multiplayer train.
What made you think of this nutty idea?: I have kids and made a train that is more of a scenery train. They sit at my desk and ride the train around like a roller coaster. It does the normal hauling, but while controlling it, you take a trip around the island(?) and it takes quite a while to get home.
Bonus idea: passive riding in train to check track/programming