GWR 3700 Class

3700 "City" class
3433 City of Bath in 1909
Type and origin Power type Steam Designer George Jackson Churchward Builder GWR Swindon Works Order number Lot 141 Serial number 1993–2002 Build date 1903 Total produced 10 new + 10 rebuilt from Atbara class Rebuilder Swindon Works Rebuild date 1902–1909
Specifications Configuration: ​  • Whyte 4-4-0  • UIC 2′B n2, later 2′B h2 Gauge 4 ft 8+1⁄2 in (1,435 mm) Leading dia. 3 ft 2 in (0.965 m) Driver dia. 6 ft 8+1⁄2 in (2.045 m) Wheelbase 8 ft 1⁄2 in (2.451 m) Loco weight 55 long tons 6 cwt (123,900 lb or 56.2 t) Total weight 92 long tons 1 cwt (206,200 lb or 93.5 t) Fuel type Coal Fuel capacity 5 tons Water cap. 3,600 imp gal (16,000 L; 4,300 US gal) Boiler GWR Standard No. 4 Cylinders Two, inside Cylinder size 18 in × 26 in (457 mm × 660 mm) Valve gear Stephenson valve gear Valve type Slide valves Loco brake Steam Train brakes Vacuum
Performance figures Maximum speed 100 mph (160 km/h) Tractive effort 17,800 lbf (79.2 kN) Factor of adh. 8.50
Career Operators GWR Class 3700 Power class GWR: A Number in class 20 Numbers (until 1912) 3400–3409, 3433–3442 (from 1912) 3700–3719 Official name City Class Axle load class GWR: Blue Withdrawn October 1927 - May 1931 Disposition One preserved, remainder scrapped

The Great Western Railway 3700 Class, or City Class, locomotives were a series of twenty 4-4-0 steam locomotives, designed for hauling express passenger trains.