Editing GWR Sun Class (section)

{{Use dmy dates|date=January 2018}}
{{Use British English|date=January 2018}}
{{no footnotes|date=December 2014}}
{{Infobox Locomotive
|name=''Sun''
|image=
|powertype=Steam
|whytetype=2-2-2
|driverdiameter={{convert|6|ft|0|in|3|abbr=on}}
|leadingdiameter={{convert|3|ft|6|in|3|abbr=on}}
|trailingdiameter={{convert|3|ft|6|in|3|abbr=on}}
|wheelbase={{convert|13|ft|8|in|3|abbr=on}}
|cylindersize={{convert|14|x|18|in|mm|0|abbr=on}} [[Bore (engine)|dia]] × [[stroke (engine)|stroke]]
|operator=[[Great Western Railway]]
|operatorclass=Sun
|gauge={{track gauge|7ft0.25in|lk=on}}
|designer=[[Daniel Gooch]]
|builder=various
}}
The [[Great Western Railway]] '''Sun Class''' were [[2-2-2]] [[broad gauge]] [[steam locomotive]]s for passenger train work. This class was introduced into service between April 1840 and January 1842, and withdrawn between January 1864 and June 1879.

A smaller-wheeled version of the [[GWR Firefly Class|Fire Fly Class]] for working trains on the hilly sections of line west of [[Swindon railway station|Swindon]], they did not prove heavy enough for the task and were later altered to become 2-2-2T tank locomotives. Later still ''Sun'', ''Hesperus'', ''Gazelle'', ''Wolf'', and ''Assagais'' were given higher pressure boilers and in this form ran until 1879; the last unrebuilt locomotive having been withdrawn in 1872.

From about 1865, the Sun Class was known as the '''Wolf Class'''.