Remembered from my school days in the 1950s:

Gentlemen will please refrain from making water
While the train is standing in the station.
Workmen working underneath might get it in the eyes and teeth,
They wouldn’t like it much and nor would you.

If you make water please call the Porter,
He will place a vessel in the vestibule.
We encourage constipation while the train is in the station,
Roses only make me think of you!