About moving the train, a very small teleport as well as a few particles or any other visual cue along with also building up speed is what I was referring to when repeatedly pressing the down key, but it's just a suggestion and I don't know if it would feel better for the game or it would actually make it worse :P How it is now is fine and I'd get used to it after a while. I think the train speed depending on the size of the train is a good idea too, but as I always tell myself on designing games, no one really knows if it's good or not until you try it, so good luck! And keep making great games ;)