70E Posted January 18, 2020 Share Posted January 18, 2020 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? Link to post Share on other sites More sharing options...
rogerzilla Posted January 18, 2020 Share Posted January 18, 2020 Snifting valve? 2 Link to post Share on other sites More sharing options...
Gordon A Posted January 18, 2020 Share Posted January 18, 2020 Or could it be the vacuum pump? Gordon A 1 Link to post Share on other sites More sharing options...
jim.snowdon Posted January 18, 2020 Share Posted January 18, 2020 It will be the vacuum pump. Jim 2 Link to post Share on other sites More sharing options...
70E Posted January 18, 2020 Author Share Posted January 18, 2020 many thanks, problem solved Link to post Share on other sites More sharing options...
bike2steam Posted January 18, 2020 Share Posted January 18, 2020 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. Link to post Share on other sites More sharing options...
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