There is no major problem here. It’s your decision whether you use trains or you exploit the game and use just trams and buses. If you want to use trains because you like trains, then use trains. I always use trains.
Exploit the game by using an included feature? That doesn’t even make sense. The game was simply not well thought out at all. It just about fails from one end to the other at every level.
#trainfeverfanboylogic