GWR 5100 Class

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GWR 5100 Class [1]
3120 as built in 1905
Type and origin Power type Steam Designer George Jackson Churchward Builder GWR Swindon Works Order number Lots 140, 150, 152, 159 Serial number 1992, 2066–2075, 2086–2096, 2138–2156 Build date 1903 Total produced 40
Specifications Configuration: ​  • Whyte 2-6-2T Gauge 4 ft 8+1⁄2 in (1,435 mm) standard gauge Leading 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) Length 41 ft 0 in (12.50 m) over buffers Loco weight 75 long tons 10 cwt (169,100 lb or 76.7 t) (76.7 t; 84.6 short tons) full Fuel type Coal Water cap. 2,000 imp gal (9,100 L; 2,400 US gal) Boiler GWR Standard No. 2 Boiler pressure 200 lbf/in2 (1.38 MPa) Heating surface: ​  • Firebox 122 sq ft (11.3 m2)  • Tubes 1,144 sq ft (106.3 m2) Cylinders Two, outside Cylinder size 18+1⁄2 in × 30 in (470 mm × 762 mm) Valve gear Stephenson Valve type Piston valves Train brakes Vacuum
Performance figures Tractive effort 5100: 25,670 lbf (114.2 kN) 8100: 28,000 lbf (120 kN)
Career Power class 4MT Number in class 40 Numbers 3100, 3111-3149 later 5100, 5111-5149 First run 1903

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.