Editing GWR 3800 Class (section)

{{Short description|Class of steam locomotive}}
{{Use dmy dates|date=February 2018}}
{{Use British English|date=February 2018}}
{{For|other GWR engine classes called 'County'|GWR County Class (disambiguation){{!}}GWR County Class}}
{{Infobox locomotive
| name = GWR 3800 'County' Class
| image = GWR 3818 County of Radnor (Boys' Book of Locomotives, 1907).jpg
| caption = 3818 ''County of Radnor'' as built in 1906
| powertype = [[Steam]]
| whytetype = [[4-4-0]]
| operator = [[Great Western Railway]]
| builder = [[Swindon Works]], [[Great Western Railway]]
| cylindercount = 2, outside
| cylindersize = {{convert|18|x|30|in|mm|0|abbr=on}}<br/> [[Bore (engine)|diameter]] x [[stroke (engine)|stroke]]
| alt = 
| designer = [[George Jackson Churchward]]
| ordernumber = Lots 149, 165, 184
| serialnumber = 2056–2065, 2209–2228, 2415–2425
| builddate = 1904, 1906, 1911–12
| totalproduction = 40
| uicclass = 
| gauge = {{track gauge|ussg|allk=on}}
| leadingdiameter = {{convert|3|ft|2|in|mm|0|abbr=on}}
| driverdiameter = {{convert|6|ft|8+1/2|in|mm|0|abbr=on}}
| wheelbase = {{convert|24|ft|0|in|mm|0|abbr=on}}
| length = 
| height = 
| axleload = {{convert|18.15|LT|t ST|2|abbr=on}}
| weightondrivers = {{convert|34.3|LT|t ST|2|abbr=on}}
| locoweight = {{convert|55.3|LT|t ST|2|abbr=on}}
| tenderweight = {{convert|36.75|LT|t ST|2|abbr=on}}
| locotenderweight = {{convert|92.05|LT|t ST|2|abbr=on}}
| fueltype = [[Coal]]
| fuelcap = 
| watercap = {{convert|3000|impgal|0|abbr=on}}
| boiler = GWR Standard No. 4
| boilerpressure = {{convert|200|psi|kPa|0|abbr=on}}
| firearea = {{convert|20.56|sqft|sqm|2|abbr=on}}
| tubearea = {{convert|1689.82|sqft|sqm|2|abbr=on}}
| fireboxarea = {{convert|128.30|sqft|sqm|2|abbr=on}}
| totalsurface = {{convert|1818.12|sqft|sqm|2|abbr=on}}
| valvegear = [[Stephenson valve gear|Stephenson]]
| valvetype = 
| tractiveeffort = {{convert|20530|lbf|kN|0|abbr=on}}
| factorofadhesion = 
| trainheating = 
| locobrakes = 
| trainbrakes = 
| safety = 
| operatorclass = 3800
| powerclass = [[Great Western Railway Power Classification|GWR: C]]
| numinclass = 40
| fleetnumbers = 3473–82, 3801–30 until Dec 1912<br />3800–39 from December 1912
| officialname = ''County''
| nicknames = Churchward's Rough Riders
| axleloadclass = [[Great Western Railway Weight Classification|GWR: Red]]
| locale = 
| withdrawndate = 1930–33
| disposition = All original locomotives [[scrap]]ped; one new-build under construction
| notes = Dimensions as built<ref name=RCTS>{{harvnb |le Fleming |1962 |pp=J10-J12}}</ref>
}}

The [[Great Western Railway]] '''3800 Class''', also known as the '''County Class''', were a class of [[Whyte notation|4-4-0]] steam [[locomotive]]s for express passenger train work introduced in 1904 in a batch of ten. Two more batches followed in 1906 and 1912 with minor differences. They were designed by [[George Jackson Churchward]], who used standard components to produce a four-coupled version of his [[GWR Saint Class|Saint Class]] [[4-6-0]]s.