I remember reading somewhere that rail, and most other mass transit, isn&#x27;t actually that efficient. The idea being that sure, a bus or train full of people is really efficient, but in order to get all of those people to want to ride it, you have to run a lot of empty or almost-empty vehicles around all the time. Sum up all the trips for the whole system, and it&#x27;s about the same as an average-ish car.