visually this game looks so nice, its simple but that works so well. i think an idle game like this is so cool, since i like train maps ahha. unfortunately i couldnt get a hub to be build, despite following directions. but aside from that, i enjoyed it. if you were to develop this further, you could consider adding traffic (train users) in certain locations, to motivate different decisions.
i think this is a really good base and could be a full game if you developed it further! gg