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GWR 4000 Class
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===Princess series=== [[File:Reading (General) geograph-2428561-by-Ben-Brooksbank.jpg|thumb|No. 4049 ''Princess Maud'']] The GWR experienced a substantial growth in long-distance passenger traffic immediately before the [[First World War]] requiring a further series of fifteen locomotives during the first six months of 1914 (Swindon Lot 199).<ref name=Nock3>{{harvnb |Nock |1980 |pp=51β2}}</ref> These were numbered 4046β4060 and named after British princesses. They were all built with {{convert|15|in|mm|0|abbr=on}} diameter cylinders and had improved boilers compared to the previous batch.<ref name=RCTS3 /> They also introduced an improved four-cone [[injector#Vacuum ejectors|vacuum ejector]] made necessary to improve braking on the increasingly long passenger trains.<ref name=Nock3 /> The locomotives were all withdrawn by British Railways between 1950 and 1957.
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