I am reminded of a parody to the tune "Humouresque" which family members, sadly no longer with us, used to sing:

Gentlemen must please refrain
From making water on the train
That's standing in the station for a while
We encourage constipation
While the train is in the station
Cross your legs, and grit your teeth, and smile.

If you must make water
Please tell the Porter
He will place a vessel in the corridor.....