Editing GWR 4000 Class (section)

{{Short description|Class of four-cylinder 4-6-0 locomotives}}
{{Use dmy dates|date=February 2018}}
{{Use British English|date=February 2018}}
{{Infobox locomotive
| name = Great Western Railway 4000 ''Star'' class
| image = GWR 4000.png
| alt = 
| caption = 4054 ''Princess Charlotte''
| powertype = Steam
| designer = [[George Jackson Churchward]]
| builder = [[Great Western Railway|GWR]] [[Swindon Works]]
| ordernumber = Lots 161, 168, 173, 178, 180, 195, 199, 217
| serialnumber = 
| buildmodel = 
| builddate = 1906–1923
| totalproduction = 73
| rebuilder = 
| rebuilddate = 
| numberrebuilt = 
| whytetype = [[4-6-0]] (prototype built as [[4-4-2 (locomotive)|4-4-2]] but rebuilt to 4-6-0 1909).
| uicclass = 2′C h4
| driver = <!-- e.g. 1st, 2nd  or 3rd coupled axle -->
| gauge = {{Track gauge|uksg|allk=on}}
| leadingdiameter = {{convert|3|ft|2|in|m|3|abbr=on}}
| driverdiameter = {{convert|6|ft|8+1/2|in|m|3|abbr=on}}
| trailingdiameter = {{convert|4|ft|1+1/2|in|m|3|abbr=on}} (4-4-2 only)
| tenderdiameter = <!-- tender wheel diameter -->
| minimumcurve = 
| wheelbase = ''Loco:'' {{convert|27|ft|3|in|m|2|abbr=on}}
| engine total = 
| leading = 
| drivers = <!-- USA terminology -->
| coupled = <!-- British terminology -->
| trailing = 
| tender total = 
| tendertruck = <!-- USA terminology -->
| tenderbogie = <!-- British terminology -->
| pivotcentres = <!-- Garratts, diesels and electrics -->
| wheelspacing = <!-- coupled wheels with asymmetrical wheel spacing -->
| length = 
| over couplers = 
| over bufferbeams = 
| width = 
| height = 
| frametype = 
| axleload = 
| leadingbogie/pony = <!-- load on leading bogie or pony wheel -->
| coupled all = <!-- when the load on all coupled wheels are the same -->
| coupled 1 = <!-- load on 1st coupled wheel -->
| coupled 2 = <!-- load on 2nd coupled wheel -->
| coupled 3 = <!-- etc. -->
| trail bogie/pony = <!-- load on trailing bogie or pony wheel -->
| tenderbogieload = <!-- load per tender bogie, use "Truck 1:<br/>Bogie 2:" if different -->
| tenderaxle = <!-- use "Axle 1:", etc with "<br/>" for line breaks -->
| weightondrivers = 
| locoweight = {{convert|75.8|LT|t ST}}
| tenderweight = {{convert|40|LT|t ST}}
| locotenderweight = 
| tendertype = 
| fueltype = 
| fuelcap = 
| watercap = {{convert|3500|or|4000|impgal|abbr=on}}
| tendercap = 
| sandcap = 
| fireboxtype = <!-- Round-top, Belpaire, combustion chamber, etc. -->
| firearea = {{convert|27.1|sqft|m2|abbr=on}}
| boiler = GWR Standard No. 1 (with variations)
| boilertype = <!-- Domeless, etc -->
| pitch = <!-- height of boiler centreline above the railhead -->
| diameterinside = 
| lengthinside = <!-- distance between tube plates -->
| smalltubediameter = <!-- number of boiler tubes and their outside diameter -->
| largetubediameter = <!-- number of larger tubes (flues), if any, and their outside diameter -->
| boilerpressure = {{convert|225|psi|MPa|2|abbr=on|lk=on}}
| safetyvalvetype = <!-- Salter spring balance, Ramsbottom, Pop, etc. -->
| feedwaterheater = 
| totalsurface = 
| tubearea = {{convert|1686.6|sqft|m2|abbr=on}}
| archarea = 
| fluearea = 
| tubesandflues = 
| fireboxarea = {{convert|154.8|sqft|m2|abbr=on}}
| superheatertype = "Swindon No. 3"
| superheaterarea = 
| cylindercount = 4, (2 outside, 2 inside)
| cylindersize = {{convert|14+1/4|x|26|in|mm|0|abbr=on|lk=on}} -<br/> {{convert|15|x|26|in|mm|0|abbr=on|lk=on}}
| valvegear = [[Walschaerts valve gear|Walschaerts]] inside
| valvetype = [[Piston valve (locomotive)|Piston valves]]
| valvetravel = 
| valvelap = 
| valvelead = 
| transmission = 
| trainheating = 
| locobrakes = 
| locobrakeforce = 
| trainbrakes = 
| safety = 
| coupling = 
| maxspeed = 
| poweroutput = 
| tractiveeffort = {{convert|25090|lbf|kN|2|abbr=on}} - {{convert|27800|lbf|kN|2|abbr=on}}
| factorofadhesion = 
| operator = {{ubl|[[Great Western Railway]]| [[British Railways]]}}
| operatorclass = 4000 or ''Star''
| powerclass = {{ubl|[[Great Western Railway Power Classification|GWR: D]]|BR: 5P}}
| numinclass = 
| fleetnumbers = 4000–4072
| officialname = 
| nicknames = 
| axleloadclass = [[Great Western Railway Weight Classification|GWR: Red]]
| locale = 
| deliverydate = 
| firstrundate = 
| lastrundate = 
| retiredate = 
| withdrawndate = 1926–1957
| preservedunits = 
| restoredate = 
| scrapdate = 
| currentowner = 
| disposition = 15 rebuilt as [[GWR 4073 Class|Castle]] class, 1 preserved, remainder [[scrap]]ped.
| notes = 
}}
The [[Great Western Railway]] '''4000''' or '''Star''' were a class of 4-cylinder [[4-6-0]] passenger [[steam locomotive]]s designed by [[George Jackson Churchward]] for the [[Great Western Railway]] (GWR) in 1906 and introduced from early 1907. The prototype was built as a [[4-4-2 (locomotive)|4-4-2]] Atlantic (but converted to 4-6-0 during 1909). They proved to be a successful design which handled the heaviest long-distance express trains, reaching top speeds of 90&nbsp;mph (145&nbsp;km/h), and established the design principles for GWR 4-cylinder classes over the next twenty-five years.<ref>{{cite book |title=Train: The Definitive Visual History |date=2014 |publisher=DK Publishing |isbn=978-1465436580 |page=97 |url=https://books.google.com/books?id=LrWBBAAAQBAJ |access-date=2 October 2020}}</ref><ref>{{Cite book |last=Waters |first=Laurence |url=https://www.google.com/books/edition/Great_Western_Star_Class_Locomotives/pE2uDQAAQBAJ?hl=en&gbpv=0 |title=Great Western Star Class Locomotives |publisher=Pen and Sword |year=2017 |isbn=9781473871045}}</ref><ref>{{Cite book |last=Wragg |first=David |url=https://www.google.com/books/edition/The_GWR_Handbook/pGAvDwAAQBAJ?hl=en&gbpv=0 |title=The GWR Handbook: The Great Western Railway 1923-47 |publisher=History Press |year=2017 |isbn=9780750985420}}</ref><ref>{{Cite book |last=Jackson |first=Allen |url=https://www.google.com/books/edition/Great_Western_Railway_Stars_Castles_and/Si53DwAAQBAJ?hl=en&gbpv=0 |title=Great Western Railway Stars, Castles and Kings |publisher=Crowood Press |year=2018 |isbn=9781785004827}}</ref>