I was going to ask the same thing…how many can a train pull without losing speed. Personally I liked the system in the good old Railroad Tycoon where you could show up information about the trains. And it showed it’s speed with 1, 2, 3… up to 9 wagons. No calculations were needed. It may not work this way with Train-Fever due to different wagon weights…but some help in the GUI would for sure be helpful.