The game is very cute and the artstyle adorable. I think the 60sec cap would not have been necessary (or could increase with every passenger picked up), I'd like more time to build my little train empire :)
In some tries the map took a while to load (the timer of the first passenger was already 3/4), sometimes it didn't. It would be nice to be able to place multiple tiles of the same tile without reselecting and for example cancel the selection with right click.
A highscore-screen before the game closes would be nice. Overall I think that could be a nice cozy game to expand upon. Nice submission!