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Kylchap
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===Great Britain=== Sir [[Nigel Gresley]] of the [[London and North Eastern Railway|LNER]] became a proponent when he incorporated [[double chimney|double]] Kylchap exhausts into four of his A4 Pacifics, including the world speed record holder [[LNER Class A4 4468 Mallard|''Mallard'']]. [[Arthur Peppercorn]]'s post-war LNER Pacifics also incorporated them, including preserved [[LNER Peppercorn Class A2|A2]] [[LNER Peppercorn Class A2 60532 Blue Peter|532 ''Blue Peter'']], and the recreated [[LNER Peppercorn Class A1 60163 Tornado|''A1 Tornado'']]. Originally, Kylchap exhausts were expensive and rarely used because the design was patented and subject to a licence fee but, after the patent expired, many more locomotives were retrofitted, including all the remaining A3 and A4 class, because the manufacturing cost was relatively low. The last steam express passenger locomotive built in Britain, [[BR Standard Class 8|''Duke of Gloucester'']], was not fitted with a Kylchap exhaust in service, despite plans to do so, but one was fitted when it was renovated in preservation, after it was realised that poor draughting had been one of the biggest reasons behind its poor performance in its service days. A Kylchap exhaust is fitted to the [[Stainmore Railway Company]] industrial [[0-4-0]][[Tank_locomotive#Saddle_tank|ST]] locomotive "F.C. Tingey", located at Kirkby Stephen East station. Kylchap exhausts were also fitted to some British-built export locomotives, primarily [[Garratt locomotive]]s for Africa.{{cn|date=January 2025}}
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