So personally I think that in train mode or in fly/ build mode, there should be an option that you could add little passenger seats on the back of your train, and have the option if you want to put people in those carts, and which carts should have wooden people in them like these: 
I don't know, just a little thing that I thought would be a nice addition to the game. Other than that, the game really touched me, as when I was young I thought of how cool it would be to be a tiny person on one of these wooden trains or hot wheels cars just riding on the track all day long.