> take sleds each containing a car with 2 people, paced 300ft apart traveling at 125mph. that is 2 people (125mph / 0.0568182mi) = 4400 people per hour* I thi

> take sleds each containing a car with 2 people, paced 300ft apart traveling at 125mph. that is 2 people (125mph / 0.0568182mi) = 4400 people per hour* I think 300 ft is for 75 mph. Using https://en.wikipedia.org/wiki/Braking_distance https://en.wikipedia.org/wiki/Braking_distance, the distance at 125 mph is 55 m/s * 55 m/s / (2 * 1 * 10 m/s2) = 150 m = 500 ft, resulting in 2 people * 125 mph / 0.09 mi = 2.8 khumans/h. (On the demo video, their vehicles look like they are tire-on-asphalt.) Also, subways have a typical capacity closer to 30 khumans/h in dense urban areas (https://www.thoughtco.com/passenger-capacity-of-transit-2798765 https://www.thoughtco.com/passenger-capacity-of-transit-2798...).