GWR 3150 Class

The Great Western Railway (GWR) 3150 Class was a class of 2-6-2T side tank steam locomotive.

GWR 3150 Class [1]
3171 at Gloucester (Horton Road) Depot 1948
Type and origin Power type Steam Designer George Jackson Churchward Builder GWR Swindon Works Order number Lots 159, 169, 172 Serial number 2157, 2239–2258, 2280–2299 Build date 1906–1908 Total produced 41
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 64 long tons 13 cwt (144,800 lb or 65.7 t) (65.7 t; 72.4 short tons) empty 81 long tons 12 cwt (182,800 lb or 82.9 t) (82.9 t; 91.4 short tons) full Fuel type Coal Water cap. 2,000 imp gal (9,100 L; 2,400 US gal) Firebox: ​  • Grate area 20.56 sq ft (1.910 m2) Boiler GWR Standard No. 4 Boiler pressure 200 lbf/in2 (1.38 MPa) Heating surface: ​  • Firebox 128.72 sq ft (11.958 m2)  • Tubes 1,349.64 sq ft (125.386 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 25,670 lbf (114.2 kN)
Career Power class 4MT Number in class 41 Numbers 3150-3190 First run 1907

History

Churchward based the 3150 class on his 3100 (later 5100) class. They used the larger and heavier Standard 4 boiler and so had greater boiler capacity, but were consequently heavier and thus restricted to Red routes. They were principally heavy suburban passenger traffic engines. Five of the class were rebuilt into the Collett 3100 Class. None of the class were preserved.

Table of orders and numbers^[2]

Year	Quantity	Lot No.	Works Nos.	Locomotive numbers	Notes
1906	1	159	2157	3150
1907	20	169	2239–2258	3151–3170
1907–08	20	172	2280–2299	3171–3190

See also

• GWR 3100/5100 Class (1906)
• GWR 5101 Class
• GWR 6100 Class
• GWR 3100 Class (1938)
• GWR 8100 Class
• List of GWR standard classes with two outside cylinders