Waffle can build as many cars of different types as Hitech wants. A simple toe in the water test would be, when Hitech brings back the supply trains, add cars with wirbles and osties on them and allow players to man those guns. As usual, other players would time the trains and obliterate them from the air or, some geniuses would spend all day driving to the train shed to sit there and blow them to scooby snacks each time they spawned. Many squads including mine have done this over the last 15 years.
So this would escalate, and some genius would say Hitech then has to create a train yard with killer AI ack to protect the train just so he can ride in the wirbel or osti parked on one of it's cars. Just so some genius in a Lancaster with 14 1000lb bombs can lancstuka the train and have the first genius back in here telling Hitech he has to cripple Lancasters or add more code infrastructure just so his train can make it to the other station with out being blown to scooby snacks.
Planes with bombs blow trains into scooby snacks......