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JohnHHill got it. Water with high mineral content would cause a locomotive boiler to actually foam. It wasn't practical to bring water in from elsewhere, so the RR would install water treatment facilties to romove the minerals. Some roads used a high tower constructed by the water treatment people; other roads required the fireman to dump a sack of treatment in the tender tank. Now that's the original "foamer". The modern railfan foamer might be a bit of all written above...
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