I really like the subway's design, but I wish there was a way to utilize it more since it looks the same in each location. It would be cool if you could stick flyers onto the wall announcing what you're selling in your tower, upcoming parties, etc. I know there is something like this in Groddle Tower already, but it would be more viewable and liven up the little subway terminal. They could also begin to serve as a type of "hub" for players to gather.