If you check out "Hot Soup's" CD you will find the humorous lines from "Passengers Will Please Refrain" on the last track. Very clever.They title it "Humoresque" and credit Oscar Brand as the author. Oscar Brand, in turn, credits Justice Wm O Douglas as the author.
Since you cannot flush in the station one verse gives good advice:"...If you have to pass some water/Kindly call the Pullman Porter/ etc;
Bill H