Letting off steam, the quiet way, Mufflers and Blow back valves

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#1
In the past when steam trains let off excess steam at a station the noise could be extremely loud. The city of Boston looked into this problem as the complaints mounted up. Ashton Valve came up with a solution that proved very popular with the Train companies. A muffler! Same idea as on automobiles. And the blow back valves actually saved steam that used to be wasted.
 

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#3
In 1879, the State of Massachusetts was asked to look into the problem of excessive noise due to safety valves and vacuum breaks on locomotive engines.
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