On-board toilet
On-board toilets are enclosures equipped with a toilet for the use of human excretion, typically mounted within a vehicle.
The small rooms also often are equipped with at least a sink, liquid soap, and paper towels for hand washing. Except in luxury versions, toilets of this kind are usually small and uncomfortable.
The excreta are stored in a holding tank or, on some ships, piped overboard. They are found in large aircraft, ships including manned spacecraft, some road vehicles and many passenger train cars.
