Thanks didn't know that cars could be removed on the fly, I imagine they would require to remove ones from opposite ends at the same time to maintain balance, still it would lead to uneven wait times it's not like you could removed 4 cars and the rest would space themselves out automatically not to mention storage space would need to be huge. As for turning down the speed that would kind of defeat the purpose wouldn't it? That would be like reducing skytrain capacity by slowing down the trains.
Still think this thing will be dependent on safety requirements, could see CUPE trying to mandate an attendant per cabin. This is a different beast then unmanned skytrain cars. What does Portland do?