Editing GWR 4100 Class (section)

{{Short description|Class of 84 British 4-4-0 locomotives}}
{{Use dmy dates|date=February 2018}}
{{Use British English|date=February 2018}}
{{Infobox locomotive
| name             = GWR 4100 class
| image            = 3373 Atbara.jpg
| alt              = 
| caption          = 3373 ''Atbara'' {{circa|1900–1902}}
| powertype        = Steam
| designer         = [[William Dean (engineer)|William Dean]]
| builder          = GWR [[Swindon Works]]
| ordernumber      = Lots 109, 125, 126, 176
| serialnumber     = 1592–1611, 1826–1865, 2330–2349
| buildmodel       = 
| builddate        = 1897–1908
| totalproduction  = 80
| rebuilder        = 
| rebuilddate      = 
| numberrebuilt    = 
| whytetype        = [[4-4-0]]
| uicclass         = 2′B n2
| driver           = <!-- e.g. 1st, 2nd  or 3rd coupled axle -->
| gauge            = {{track gauge|56.5in}}
| leadingdiameter  = 
| driverdiameter   = <!-- USA terminology -->
| coupleddiameter  = <!-- British terminology -->
| trailingdiameter = 
| tenderdiameter   = <!-- tender wheel diameter -->
| minimumcurve     = 
| wheelbase        = 
|  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 -->
|  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       = 
| tenderweight     = 
| locotenderweight = 
| tendertype       = 
| fueltype         = 
| fuelcap          = 
| watercap         = 
| tendercap        = 
| sandcap          = 
| fireboxtype      = <!-- Round-top, Belpaire, combustion chamber, etc. -->
|  firearea        = 
| boiler           = <!-- Watson Standard no. x, etc -->
|  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   = 
| safetyvalvetype  = <!-- Salter spring balance, Ramsbottom, Pop, etc. -->
| feedwaterheater  = 
| totalsurface     = 
|  tubearea        = 
|  archarea        = 
|  fluearea        = 
|  tubesandflues   = 
|  fireboxarea     = 
| superheatertype  = 
|  superheaterarea = 
| cylindercount    = Two
| cylindersize     = 
| valvegear        = 
| valvetype        = 
| valvetravel      = 
| valvelap         = 
| valvelead        = 
| transmission     = 
| trainheating     = 
| locobrakes       = 
| locobrakeforce   = 
| trainbrakes      = 
| safety           = 
| coupling         = 
| maxspeed         = 
| poweroutput      = 
| tractiveeffort   = 
| factorofadhesion = 
| operator         = [[Great Western Railway]]
| operatorclass    = 
| powerclass       = 
| numinclass       = 
| fleetnumbers     = {{ubl|''New:'' 3291–3311, 3373–3412, 4101–4120|''from 1912:'' 4100–4172}}
| officialname     = 
| nicknames        = 
| axleloadclass    = 
| locale           = 
| deliverydate     = 
| firstrundate     = 
| lastrundate      = 
| retiredate       = 
| withdrawndate    = 
| preservedunits   = 
| restoredate      = 
| scrapdate        = 
| currentowner     = 
| disposition      = All scrapped
| notes            = 
}}

The '''GWR 4100 Class''' was a class of steam [[locomotive]]s in the [[Great Western Railway]] (GWR) of the [[United Kingdom]].

The '''Badminton''' class express passenger [[4-4-0]] steam [[locomotive]]s were introduced in 1897 as a development from the earlier [[GWR 3252 Class|Duke class]]. The name Badminton was chosen after the [[Duke of Beaufort]]'s [[Badminton House|Badminton estate]], through which the GWR was building [[South Wales Main Line|a new line to South Wales]] at the time.<ref name="Davies1993">{{harvnb |Davies |1993 |p=107}}</ref>

Further modifications to the design resulted in the '''Atbara''' Class entering service in 1900, the names for these locomotives generally being taken from contemporary military engagements or senior army commanders. Later engines were named after cities of the British Empire.

The final batch of locomotives were named after varieties of garden plant and in consequence were known as the '''Flower''' Class.

These three types were later standardised and treated as a single class, so are listed together here. Four other prototype 4-4-0s, originally built in 1894 as the '''Armstrong''' Class, were also later rebuilt as Badmintons (see below).

This class were subject to the [[Locomotives of the Great Western Railway#1912 Renumbering|1912 renumbering]] of GWR 4-4-0 locomotives, which saw the Bulldog Class gathered together in the series 3300–3455, and other types renumbered out of that series. This class took numbers 4100–4172 (of which numbers 4101–4120 had previously been used by Flower Class locomotives).