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How does this Walschaerts valve gear work and how does it make the 1522 go forwards or backwards?

April 26, 2017backwards forwards Gear valve

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How does this Walschaerts valve gear work and how does it make the 1522 go forwards or backwards?

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Rather than trying to explain it here, we have a link to a neat web site provided by Robert Booty where he actually shows how a Walschaert’s valve gear works using animated GIFs. Click anywhere on these words to check it out – and be sure to look at the large GIF he has which shows how the linkages are arranged to go forwards and backwards.