It would be nice if they added more functionality to the big transport hubs like train stations. They occupy a lot of space in the neighbourhood, so there should be some more functionality added to them. They could add various interactions like buy a ticket to go somewhere (elders could have free tickets any time), daredevil/mischievous sims could have the option to ride without a ticket and maybe get a fine, use the bathroom, spot interesting trains like the Orient Express, the Flying Scotsman and take pictures of them, eat or drink something at the train station cafe or restaurant, sleep in the waiting room, busk for tips, etc.