Machu Picchu runs on timed tickets
Entry is by timed slot with a named circuit, the train from Ollantaytambo is booked separately, and the bus up from Aguas Calientes is its own queue. Three bookings, three operators, all held on a phone, in a town at the end of a valley where the alternative to data is a hostel Wi-Fi signal shared with everyone else trying to do the same thing.

