I have a steam train whistle purchased when they scrapped the B & M steam engines in the 1950's. It hasn't been used since we closed the shop in 1975, but it is very possible others bought similar whistles. Based on my experience, most of the steam boats don't have enough excess steam pressure to blow the whistle much and continue turning the propeller, but it could be connected to an air air compressor and make an occasional toot. Mine is about 16" tall and maybe 7" diameter with a 1 1/2" feed pipe. Five chines and very pretty sound.
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