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This article is about the 40 locomotives built in 1903–06. For the 140 locomotives built in 1929–49, see GWR 5101 Class.
The Great Western Railway (GWR) GWR 5100 Class (known as the 3100 class between 1912 and 1927) was a class of 2-6-2T side tanksteam locomotives. It was the first of a series of broadly similar classes used principally for suburban passenger services.
5141 (ex 3141) at Haresfield Naas Crossing in 1950
The class was developed from one of George Jackson Churchward's pioneer designs – No 99 – and a number of derivative classes were built from 1906 to 1950. The development is somewhat convoluted to follow, because of various renumberings and gaps in the number series as listed below.[1]
No. 99 was built in 1903 and given an extended trial over the ensuing two years. Fitted with the standard number 2 boiler running at 200 psi (1.38 MPa), flat topped tanks and driving wheels of 5 feet 8 inches (1.727 m) in diameter, it was the forerunner of 289 similar locomotives that were to follow. 39 more examples were built to this initial design. This production batch differed from the prototype only in that the tank tops were sloping to aid visibility and the cab sides were incorporated into the tanks. The running numbers of this batch were 3111 to 3149 and the prototype was renumbered 3100 in 1912. They received enlarged coal bunkers. In 1927, after some improvements to weight distribution, the class was renumbered 5100 and 5111 to 5149.
The 3150 Class was a 1906 version of the 3100, fitted with the larger and heavier Standard 4 boiler. They were numbered from 3150 to 3190.
The 5101 Class were fundamentally Collett versions of the 5100 class, built from 1929 to 1949 with the Standard 2 boiler. They were numbered 5101–5110, 5150–5199 and 4100–4179.
The 1931 6100 Class were more powerful versions of the 5101, fitted with a version of the Standard 2 boiler with higher working pressure, giving the locomotives greater tractive effort. They were numbered 6100–6169.
The Collett 3100 Class were members of the 3150 class, rebuilt in 1938/39 with smaller driving wheels. They retained the larger Standard 4 boiler from the 3150s and were numbered 3100–3104.
The 8100 Class (see below) were members of the 5100 class rebuilt in 1938/39 with smaller driving wheels and the same higher pressure version of the Standard 2 boiler as the 6100 class. They were numbered 8100–8109.
8100 class
8100 Class rebuild 8103 (ex 5145) at Carmarthen loco shed on 16 April 1961
In 1938/39 ten members of the 5100 series were rebuilt with 5 feet 6 inches (1.676 m) driving wheels and 3-foot pony truck wheels. They retained the number 2 boiler, but again pressed to 225 psi as in the 6100. Numbers 5100 (the original 1903 prototype number 99 now being renumbered for the third time), 5123, 5118, 5145, 5124, 5126, 5120, 5116, 5133 and 5115, were renumbered 8100 to 8109. This 8100 class were intended to bolster the 6100 class on London suburban duties, with the smaller driving wheels giving a supposed benefit of better acceleration.[1] Whatever the practical advantage in performance, the class became widely dispersed and locos were used alongside their predecessors indiscriminately.
None of the 8100 class have been preserved.
GWR Prairies
The 2-6-2 wheel arrangement is nicknamed "Prairie". The Churchward 3100/5100, 3150, 5101, Collett 3100, 6100 and 8100 classes are collectively nicknamed "Large Prairies" while the smaller 4400, 4500 and 4575 classes are known as "Small Prairies".
^ abcdle Fleming, H.M. (February 1962). White, D.E. (ed.). The Locomotives of the Great Western Railway, part nine: Standard Two-Cylinder Classes. RCTS. p. J28-J38.
Allcock, N. J.; Davies, F. K.; le Fleming, H. M.; Maskelyne, J. N.; Reed, P. J. T.; Tabor, F. J. (1968) [1951]. White, D. E. (ed.). The Locomotives of the Great Western Railway, part one: Preliminary Survey. Kenilworth: RCTS.
le Fleming, H.M. (February 1962). White, D.E. (ed.). The Locomotives of the Great Western Railway, part nine: Standard Two-Cylinder Classes. RCTS.
Champ, Jim (2018). An introduction to great western locomotive development. PEN & SWORD TRANSPORT. ISBN 978-1-4738-7784-9
August 22, 2023
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This article relies largely or entirely on a single source Relevant discussion may be found on the talk page Please help improve this article by introducing citations to additional sources Find sources GWR 5100 Class news newspapers books scholar JSTOR December 2014 This article is about the 40 locomotives built in 1903 06 For the 140 locomotives built in 1929 49 see GWR 5101 Class The Great Western Railway GWR GWR 5100 Class known as the 3100 class between 1912 and 1927 was a class of 2 6 2T side tank steam locomotives It was the first of a series of broadly similar classes used principally for suburban passenger services GWR 5100 Class 1 GWR 3120 Prairie locomotive in as built condition Howden Boys Book of Locomotives 1907 Type and originPower typeSteamDesignerGeorge Jackson ChurchwardBuilderGWR Swindon WorksOrder numberLots 140 150 152 159Serial number1992 2066 2075 2086 2096 2138 2156Build date1903Total produced40SpecificationsConfiguration Whyte2 6 2TGauge4 ft 8 1 2 in 1 435 mm standard gaugeLeading dia 3 ft 2 in 0 965 m Driver dia 5 ft 8 in 1 727 m Trailing dia 3 ft 8 in 1 118 m Length41 ft 0 in 12 50 m over buffersLoco weight75 long tons 10 cwt 169 100 lb or 76 7 t 76 7 t 84 6 short tons fullFuel typeCoalWater cap 2 000 imp gal 9 100 L 2 400 US gal BoilerGWR Standard No 2Boiler pressure200 lbf in2 1 38 MPa Heating surface Tubes1 144 sq ft 106 3 m2 Firebox122 sq ft 11 3 m2 CylindersTwo outsideCylinder size18 1 2 in 30 in 470 mm 762 mm Valve gearStephensonValve typePiston valvesTrain brakesVacuumPerformance figuresTractive effort5100 25 670 lbf 114 2 kN 8100 28 000 lbf 120 kN CareerPower class4MTNumber in class40Numbers3100 3111 3149later 5100 5111 5149First run1903 Contents 1 History 2 Developments of the 3100 5100 Class 1 3 8100 class 4 GWR Prairies 5 See also 6 ReferencesHistory Edit 5141 ex 3141 at Haresfield Naas Crossing in 1950The class was developed from one of George Jackson Churchward s pioneer designs No 99 and a number of derivative classes were built from 1906 to 1950 The development is somewhat convoluted to follow because of various renumberings and gaps in the number series as listed below 1 No 99 was built in 1903 and given an extended trial over the ensuing two years Fitted with the standard number 2 boiler running at 200 psi 1 38 MPa flat topped tanks and driving wheels of 5 feet 8 inches 1 727 m in diameter it was the forerunner of 289 similar locomotives that were to follow 39 more examples were built to this initial design This production batch differed from the prototype only in that the tank tops were sloping to aid visibility and the cab sides were incorporated into the tanks The running numbers of this batch were 3111 to 3149 and the prototype was renumbered 3100 in 1912 They received enlarged coal bunkers In 1927 after some improvements to weight distribution the class was renumbered 5100 and 5111 to 5149 None of the 5100 class have been preserved Table of orders and numbers 2 Year Quantity Lot No Works No Locomotive numbers Notes1903 1 140 1992 99 renumbered 3100 in 19121905 10 150 2066 2075 3111 31201905 10 152 2085 2095 3121 31311906 19 159 2138 2156 3131 3149Developments of the 3100 5100 Class 1 EditThe 3150 Class was a 1906 version of the 3100 fitted with the larger and heavier Standard 4 boiler They were numbered from 3150 to 3190 The 5101 Class were fundamentally Collett versions of the 5100 class built from 1929 to 1949 with the Standard 2 boiler They were numbered 5101 5110 5150 5199 and 4100 4179 The 1931 6100 Class were more powerful versions of the 5101 fitted with a version of the Standard 2 boiler with higher working pressure giving the locomotives greater tractive effort They were numbered 6100 6169 The Collett 3100 Class were members of the 3150 class rebuilt in 1938 39 with smaller driving wheels They retained the larger Standard 4 boiler from the 3150s and were numbered 3100 3104 The 8100 Class see below were members of the 5100 class rebuilt in 1938 39 with smaller driving wheels and the same higher pressure version of the Standard 2 boiler as the 6100 class They were numbered 8100 8109 8100 class Edit 8100 Class rebuild 8103 ex 5145 at Carmarthen loco shed on 16 April 1961In 1938 39 ten members of the 5100 series were rebuilt with 5 feet 6 inches 1 676 m driving wheels and 3 foot pony truck wheels They retained the number 2 boiler but again pressed to 225 psi as in the 6100 Numbers 5100 the original 1903 prototype number 99 now being renumbered for the third time 5123 5118 5145 5124 5126 5120 5116 5133 and 5115 were renumbered 8100 to 8109 This 8100 class were intended to bolster the 6100 class on London suburban duties with the smaller driving wheels giving a supposed benefit of better acceleration 1 Whatever the practical advantage in performance the class became widely dispersed and locos were used alongside their predecessors indiscriminately None of the 8100 class have been preserved GWR Prairies EditThe 2 6 2 wheel arrangement is nicknamed Prairie The Churchward 3100 5100 3150 5101 Collett 3100 6100 and 8100 classes are collectively nicknamed Large Prairies while the smaller 4400 4500 and 4575 classes are known as Small Prairies See also EditGWR 3150 Class GWR 5101 Class GWR 6100 Class GWR 3100 Class 1938 List of GWR standard classes with two outside cylindersReferences Edit a b c d le Fleming H M February 1962 White D E ed The Locomotives of the Great Western Railway part nine Standard Two Cylinder Classes RCTS p J28 J38 Allcock et al 1968 pp 29 30 Allcock N J Davies F K le Fleming H M Maskelyne J N Reed P J T Tabor F J 1968 1951 White D E ed The Locomotives of the Great Western Railway part one Preliminary Survey Kenilworth RCTS le Fleming H M February 1962 White D E ed The Locomotives of the Great Western Railway part nine Standard Two Cylinder Classes RCTS Champ Jim 2018 An introduction to great western locomotive development PEN amp SWORD TRANSPORT ISBN 978 1 4738 7784 9 Retrieved from https en wikipedia org w index php title GWR 5100 Class amp oldid 1106848735 8100 class, wikipedia, wiki, book, books, library,
