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Having introduced a range of standard locomotives designed for heavier services, GWR CME George Jackson Churchward asked his lead draughtsman Harold Holcroft to produce "...''a 2-6-0 with 5 foot 8 inch wheels, outside cylinders, the No. 4 boiler and as many standard parts as could be used''". The resulting 4300 class first appeared in 1911 and proved successful with 322 built by 1925, sometimes incorporating detailed differences. A final batch of 20 built in 1932 incorporated further design changes by Churchward’s successor, Charles Collett. These included the introduction of side window cabs, outside steam pipes, a screw reverser, and a weight attached to the buffer beam to place more weight on the leading pony wheels and reduce wear on the leading driving wheels. As a result of these modifications, 7325 (originally 9303) is often referred to on the SVR as the "Collett Mogul".
Moguls (not including those with Red axle load restrictions) operated excursions on the Kidderminster – Bewdley – Stourport triangle from the 1930s. In the late 1950s 4 moguls were allocated to [[Kidderminster Shed]] to work coal trains from [[Alverley Alveley Colliery]] to the power stations at [[Stourport Power Station|Stourport]] and [[Ironbridge power station|Buildwas]] and sugar beet trains to [[Foley Park]]<ref>GWR(SVR)A appeal leaflet</ref>.
==9303/7325 in service==
