How things have changed. When I lived with my brother in Brisbane, whilst attending college, he had sewerage. Using the loo in moving vehicles can be a challenge.
Buses are the worst.
There is a light over the driver's head, which comes on when someone is in the loo. That is the time when he corners as quickly as possible, swerves to avoid non-existing objects etc. When you are in a train loo, this is the time the train clackerty-clacks and sways over links and sidings. The aircraft loos are the ones. You are having a wonderfully smooth trip, no turbulence, and you decide to visit the loo.