Pneumatic tube means a single transport vessel going in 1 direction per "airlocked" region of tube, as well as needing to be airtight. Having self-powered elec

Pneumatic tube means a single transport vessel going in 1 direction per "airlocked" region of tube, as well as needing to be airtight. Having self-powered electric vehicles means cheaper infrastructure and multiple vehicles going in both directions at once. Thanks :)