Generously assuming that it averages 150mph, and very generously assuming 1.5 people per car and estimating from the video a gap between sleds of 40m gives a capacity of around 9,000 pax/hr per line. The Tube in London has trains with around 900 pax capacity, and they run at around 90 second intervals at peak time, giving 40 trains per hour and 36,000 pax/hr.