When I was riding Frisco trains as a boy in the '30s and '40s (my Dad was an employee) the conductor would lock the restrooms if we were going to be sitting in a station for any length of time, then unlock them when the train started up. Dad said you had to watch where you stepped if you were out in the country on the line somewhere.
Flushing toilets in train station pre holding tank era must have made for smelly stations - Classic Trains Magazine
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