The bottom outlet valves used on steam era tank cars were 4 & 6 inch plug valves, the same design that's still in used today. On the tanks with expansion domes the valve handle (wheel) was located in the dome.
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I'm sure they were used often.
--- In STMFC@yahoogroups.com, Anthony Thompson <thompson@...> wrote:
Ed Mines wrote:
The bottom valves on steam era tank cars are way too small to allow Where do you get this idea? It was done very widely and all the
the car to be emptied in a timely manner.
time. And photos I've seen of top unloading pipes are no larger than
the outlet pipes at the bottom.
I have a feeling they were difficult to open too; otherwise thieves, Nope, the accessible part is just a pipe cap on the outlet
vandals, hobos etc. would be opening them.
pipe, but that's not enough to unload. You also have to open the
valve, which is INSIDE the tank and operated from the dome. See any
steam-era Cyc or a book like Ed Kaminski's _AC&F Tank Cars_ for
I think tank cars used to transport ashphalt, roofing tar etc. were Not at all. Tank cars could be and were cleaned for new
the tank car equivalent of hide loading box cars.
cargoes. Of course it cost time and money, but it was certainly
possible. The major exceptions were cars with particular linings, such
as rubber linings for acid, which you would not want to use for
anything which could interact with the lining.
Tony Thompson Editor, Signature Press, Berkeley, CA
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