well here is my view on trains. i like them its a nice add on to an already great game but i can see it ruining it if they go to far with them. why buy facilities when you can buy a train, as long as facilities stay important and you still need to plan for basic resources its a good add on. once you start to leave the old facilities then you lose a lot of the fun. (EG: why buy a rubber factory when you can get a train to do it for you, you then lose the uses for trees why bother getting them). If you carry on down this road you will start to lose a lot of the fun. As of this moment they in my view haven't gone too far and is great for the game just be careful.
I would just like to say thanks for the great game over the years please carry on the good work.