 In 1962, Bulleid Battle of Britain class 4-6-2 34064 "Fighter Command" was fitted with a Giesl ejector on the grounds that a desired spark arrestor would "suffocate" an ordinary blastpipe.It quickly became apparent, following some adjustment, that the ejector improved the locomotive design, and it was held in high regard by the crews.A BR Standard Class 9F 2-10-0 92250 was also fitted with a Giesl ejector, but with "indifferent" results.