One day a man travelling on the underground was bursting to go to toilet. So he thought that there was one station that solved it all.
That station was Portaloo.
Portaloo Station is the most important station on the London Underground because it is the only station where people can stop at if they need the toilet.
Unless you need to go to toilet you don't need to get off at Portaloo Station.
Portaloo is a district in the London Borough of Lambeth, the only district where public toilets are abundant.
The name actually means 'Waterloo in a toilet'.