After like 5 mins, the "up" and "down" buttons stopped working. Can't see a reason why.
It is possible that 'Express' mode is activated. Pressing the right arrow key enables/disables it. In Express mode, all other input is disabled and the train drives itself. I'm making a note to make this work like announcing the last stop, where you hold down the left arrow key, so it is more difficult to accidentally end up in that mode.
Thanks for reporting this :)