Hogwarts Express

The train whistled, opening its doors. You are the train platform 9 3/4, which you had to get to by running through a wall...? You're still a bit shaken from that experience. The dozens of kids, aged 11 to 18, pour onto the train. You follow. There's quite a bit of chaos, but it eventually dies down. You grab your luggage, affectionately yoinking your familiar and bringing them on as well. You find a mostly empty compartment, settling down for the long ride ahead.