Re: "Do not flush in spacedock":
It was indeed an allusion to "Do not flush in station."
I've been aboard a vintage caboose, in which the "hopper" was literally that: a non-flushing hopper that was open to the ground at trackside. Conveniences aboard mid-20th-century passenger cars were slightly more elaborate, in that they flushed, and they had a flap on the bottom, that opened for the flushing cycle.
During the late 1980s and early 1990s, Amtrak phased out the "do not flush in station" toilets it inherited; during that era, car attendants locked the old-style conveniences before every station stop. I did "#1" aboard a former Santa Fe "El Capitan" coach; it was an interesting experience. I'd have to be kind of desperate, I think to do "#2" in a hopper.
It was indeed an allusion to "Do not flush in station."
I've been aboard a vintage caboose, in which the "hopper" was literally that: a non-flushing hopper that was open to the ground at trackside. Conveniences aboard mid-20th-century passenger cars were slightly more elaborate, in that they flushed, and they had a flap on the bottom, that opened for the flushing cycle.
During the late 1980s and early 1990s, Amtrak phased out the "do not flush in station" toilets it inherited; during that era, car attendants locked the old-style conveniences before every station stop. I did "#1" aboard a former Santa Fe "El Capitan" coach; it was an interesting experience. I'd have to be kind of desperate, I think to do "#2" in a hopper.