A valid transport ticket should include free access to station toilets
Friction: Free station toilets can reduce onboard servicing costs and improve passenger comfort.
Why this matters
Anyone with a valid transport ticket should be able to use the station toilets at no extra charge. Charging at the station gives passengers a reason to wait and use the toilet on the train instead.
That can shift demand to a more expensive place to meet it: onboard toilets need cleaning, waste-tank servicing, and maintenance of equipment fitted into a moving vehicle. Free access at the station can reduce pressure on those facilities while making the journey more comfortable, with less waiting and less need to move through the train.
Good Sense principle
Consider the total cost of the journey, including cleaning, maintenance, and passenger comfort. A station toilet fee may generate revenue locally while shifting greater costs onto train operations. Include station toilet access in the ticket and make the convenient choice economical for the transport system as a whole.