I think we should be able to have custom formations. Like when you add LIRR to TSW2 give us the option to put 2 cars if we wanted and up to 12 cars if we want. Also if we wanted to put a MP15DC with a MP36PH-3C that would be nice or even be able to carry Gallery Cars as cargo with a CSX train. These are just examples but I think it would be great on all trains. One more thing it would be nice if the train didn’t have to fit into the station platforms because IRL sometimes not every part of a train fits on a platform.
As long as your train fits in its starting platform, you can stop at any station along the way even if the platform is shorter than your train. The maximum length is displayed wrong, it should display the length of the starting platform but it wrongly displays it as the length of the shortest platform you're stopping at. So just ignore the maximum length and put on a longer train if you want, it'll let you as long as it fits in your starting station.