Neat game! As a person who loves these kinds of management games, I can see how this can make me spend a lot of time playing once there is a bit more to do than just building trains. :)
For me it wasn't entierly clear in the beginning if moving your train along ressources would be enough to pick them up, maybe you could add a note in the manual for that. Also it's a bit fiddly to change the rail crossings direction when the camera is moving; didn't feel responsive enough. Otherwise a really enjoyable experience :D