@LeaveNothingForTheFuture @humantransit I'm honestly not even sure it's a closed system. He shows cars going in from the surface so that implies at least some of the cars drive back outside the loop, probably because there's not enough passenger demand in the other direction.

Given that the entire selling point was having private "cabins" I also think him being grouped with other passengers was an attempt to increase throughput, which is known to be abysmal.