It would be nice if we had a choice between a number of good trains to pick from. The way it is now, each era you really only have one good choice that you race to get. What if we had 2 or 3 decent options. If the speeds and acceleration were better on some of them they might be worth using but all they are now are trains no one will use and just placeholders so we have to spend lab points to get to the good trains. It would be interesting to have people using a lot more diverse trains instead of all using the same ones.
