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70E

GWR Locomotives

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Please forgive the ignorance of this question but what is it on GWR locos that makes a rhythmic phsst, phsst, phsst, when slowing down etc is it an injector?

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Or could it be the vacuum pump?

 

Gordon A

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many thanks, problem solved

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Most noticeable when a loco is coasting, as you say a 'psst' noise or a 'tic' ( as on exGW larger locos), it's a snifting ( anti-vacuum) valve for the cylinders.

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