Have they been tested with full passenger loads over sustained periods of time? I have some experience with rail in the Bay Area when trains are full, and I'd be very concerned about things like propulsion, overheated brakes, jammed doors and malfunctioning air conditioning when those trains are packed with passengers. Recall that the AirTrain at JFK ran tests with concrete blocks inside the cars to simulate the weight of full passenger loads. Are they doing something like that in the testing process in Rio?

Also, how much testing of things like fare gates, ticket machines and escalators with a substantial amount of passengers?