Air bags can be inflated/deflated. Leveling valves adjust the air pressure in them as the weight of the car fluctuates. Railroad cars, subway cars, streetcars, and buses all do this. With modern equipment, it's probably possible to program the valves to maintain different levels. Chicago Transit Authority's 5000s adjust to match the platform height after the doors open, it's almost like a bus kneeling. I've always thought that was a really neat feature, perhaps these cars have it.
Moderator: Massachusetts Bay Transportation Authority, Brightline Trains
Avatar:3679A (since wrecked)/3623B (now in service as 3636B).