No, they didn’t. I don’t use a “train of buses” (whatever that means) and trains full of people and goods constantly lose money. I have no intercity buses at all. Those two scenarios aren’t remotely related.
Wait, what? So your complaint isn’t actually about a game mechanic, it’s just about the fact that you are unable to make money? Try turning the game difficulty down then. If you can’t make money on trains on easy then I can assure you that is your problem, not the game’s.