Comment Re:Multi-mode is old news (Score 1) 146
I don't imagine it's all that hard to adapt airline toilets to a train. When you land and before you take off, the sewage can be pumped out. In fact, these just look like airline bodies without the wings/engines so anything you can fit in a cargo bay of a plane to handle air processing should work. You wouldn't really need segregated power generator systems. You'd need enough power to keep the system running between the train and the plane which a relatively small UPS could do, but once you are docked on either system you can always draw power from those.
What I'm waiting for is the "emergency ejection system" that is basically a small set of deployable wings and an automated flight landing system. Modern planes already have fairly complex auto-pilots and I believe some of them even land a plane for you. It's just a matter of wiring it up.