GWR 3100 Class

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This article is about the 5 locomotives rebuilt in 1938/9 from the 3150 Class. For the 40 locomotives built in 1903–06 as the 3100 class, see GWR 5100 Class.
GWR 3100 Class
Specifications
Power type Steam
Designer Churchward
(rebuilt by Collett)
Builder GWR Swindon Works
Order number Lot 319
Build date 1906
Rebuild date 1938
Number rebuilt 5
Configuration 2-6-2T
UIC classification 1'C1 ht
Gauge 4 ft 8 12 in (1,435 mm)
Leading wheel
diameter
3 ft 0 in (0.914 m)
Driver diameter 5 ft 3 in (1.600 m)
Trailing wheel
diameter
3 ft 8 in (1.118 m)
Minimum curve 6 chains (400 ft; 120 m) normal,
5 chains (330 ft; 100 m) slow
Length 41 ft 0 in (12.50 m) over buffers
Width 8 ft 11 14 in (2.72 m)
Height 13 ft 2 in (4.01 m)
Axle load 19 tons 3 cwt (42,900 lb or 19.5 t) full
Weight on drivers 57 tons 6 cwt (128,400 lb or 58.2 t) full
Locomotive weight 81 tons 9 cwt (182,400 lb or 82.7 t) full
Fuel type Coal
Water capacity 2,000 imp gal (9,100 l; 2,400 US gal)
Boiler pressure 225 lbf/in2 (1.55 MPa)
Firegrate area 20.56 sq ft (1.910 m2)
Heating surface:
– Tubes
1,349 sq ft (125.3 m2)
– Firebox 128.72 sq ft (11.958 m2)
Superheater type 4-element or 6-element
Superheater area 4-element: 136.64 sq ft (12.694 m2),
6-element: 181.10 sq ft (16.825 m2)
Cylinders Two, outside
Cylinder size 18.5 in × 30 in (470 mm × 762 mm)
Tractive effort 31,170 lbf (138.7 kN)
Career
Railroad(s) GWR » BR
Class 3100
Power class GWR: D,
BR: 4MT
Number 3100–3104
Axle load class GWR: Red
Withdrawn 1957–1960
Disposition All scrapped

The Great Western Railway (GWR) 3100 Class was a class of 2-6-2T side tank steam locomotive.

History[edit]

This class of large prairie was created in 1938 when Collett rebuilt some of Churchward's 3150 Class with a view to using them as bankers, particularly from Severn Tunnel Junction shed. These engines used the standard class 4 boiler again, but pressed to 225 p.s.i. and using smaller coupled wheels of 5 feet 3 inches diameter, and a half inch increase in cylinder diameter, nominal tractive effort rose to 31,170 pounds. Almost impossible to pick out was a 2" reduction in pony truck wheel diameter to 3'. Only five engines were ever modified, namely 3173, 3156, 3181, 3155 and 3179 which were rebuilt as 3100 to 3104 respectively. None of these were preserved.

See also[edit]

References[edit]

  • Whitehurst, Brian (1973). Great Western engines, names, numbers, types, classes: 1940 to preservation. Oxford: Oxford Publishing Company. pp. 30, 102, 135. ISBN 0-902888-21-8. OCLC 815661. 

External links[edit]