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Is it a Clack Valve or not?
I can only say that when visiting the Engine House of the Severn Valley Railway I happened to mention the sound a steam engine makes when at a standstill, and someone said that it was the Clack Valve. Heads nodded at this explanation.
Whatever the cause, the sound is so evocative of railway steam engines that I would very much like to obtain a cd of this if there is one to purchase.
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Keith
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