In Oscar Brand's Bawdy Songs and Backroom Ballads you can find this"

Passengers will please refrain
From flushing toilet while the train
Is in the station,
Darling, I love you.
We encourage constipation
While the train is in the station
Moonlight always makes me think of you.

If you wish to pass some water
Kindly try the pullman porter
He'll place a vessel in the vestibule
If the vessel isn't there
Then try the platform in the rear
The one in front is likely to be cool.

If the women's room be taken,
Never feel the least forsaken,
Never show the sign of sad defeat;
Try the men's room 'cross the hall
And if some man has had the call
He'll courteously relinquish you his seat.

If these efforts are in vain,
Then kindly break the window pane
This novel method's used by very few;
We go strolling through the park,
A-goosing statues in the dark,
If Sherman's horse can take it why can't you?

re: Johnstown, PA. I had business reasons to go there by train about 25 years ago. The train didn't move much faster that the infamous Dummy Line. As it says in that song: Female passenger to conductor--Conductor, I'm going to have a baby! Conductor--You should know better than to get on in that condition. FP--I wasn't pregnant when I got on.