Editing GWR 3700 Class (section)

==Construction==
In September 1902 a member of the [[GWR 4100 Class#Atbara class|Atbara Class]], no. 3405 ''Mauritius'', was reboilered with a tapered domeless boiler and [[Belpaire firebox]]. The locomotive was the first GWR 4-4-0 to be fitted with a tapered boiler; the boiler became the prototype for [[George Jackson Churchward|Churchward's]] Standard No. 4 boiler.<ref name=OSNa58>{{harvnb |Nock |1977 |p=58}}</ref> In March 1903 the first of the City Class, no. 3433 ''City of Bath'', was completed.<ref name=OSNa59>{{harvnb |Nock |1977 |p=59}}</ref> It was fitted with the final form of the Standard No.4 boiler, with slightly curved sides and a tapered top to the firebox. Another nine locomotives were completed in May 1903.<ref name=OSNa59/> Between February 1907 and December 1908, nine Atbaras were rebuilt with this boiler and incorporated into the City Class.<ref name=OSNb89>{{harvnb |Nock |1978 |p=89}}</ref> All members of the class were withdrawn between October 1927 and May 1931.<ref name=OSNb89/><ref>{{Harvnb|Casserley|1966|p=50}}</ref>