Unless anyone has side-business on the way...(which is fine, just let me know):
Finding the monorail hub is pretty easy - it is the largest facility in the North, located directly astride the north pole of the planet. The huge, round station is filled with people and cargo, loading and unloading from trains sitting on the rails that head due south from the cardinal points of the compass. As you head for the ticket windows, a quick count shows that each train seems to have around 30 cars, giving each train almost three-quarters of a kilometer of length (each car is around 80' long, for those what don't get metric). The local subway lines seem to converge here as well, giving access to most of the Northern Sector in a matter of minutes.
In addition to the trains and ticket windows, the station is lined with shops, restaurants, and other small businesses such as insurance and travel companies. One thing you notice a distinct absence of is trashcans, but the place is immaculate - plenty of janitorial staff around. And there are a lot of cops. You step up to the ticket window... (250 per person, please mark it off)