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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
Type and origin
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
Specifications
Configuration:
• Whyte
2-6-2T
• UIC
1'C1 h2t
Gauge
4 ft 8+1⁄2 in (1,435 mm) standard gauge
Leading dia.
3 ft 0 in (0.914 m)
Driver dia.
5 ft 3 in (1.600 m)
Trailing dia.
3 ft 8 in (1.118 m)
Minimum curve
6 chains (396 ft; 121 m) normal, 5 chains (330 ft; 101 m) slow
Length
41 ft 0 in (12.50 m) over buffers
Width
8 ft 11+1⁄4 in (2.724 m)
Height
13 ft 2 in (4.013 m)
Axle load
19 long tons 3 cwt (42,900 lb or 19.5 t) (21.4 short tons) full
Adhesive weight
57 long tons 6 cwt (128,400 lb or 58.2 t) (64.2 short tons) full
Loco weight
81 long tons 9 cwt (182,400 lb or 82.8 t) (91.2 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
225 lbf/in2 (1.55 MPa)
Heating surface:
• Firebox
128.72 sq ft (11.958 m2)
• Tubes
1,349 sq ft (125.3 m2)
Superheater:
• Type
4-element or 6-element
• Heating 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)
Performance figures
Tractive effort
31,170 lbf (138.7 kN)
Career
Operators
GWR » BR
Class
3100
Power class
GWR: D, BR: 4MT
Numbers
3100–3104
Axle load class
GWR: Red
Withdrawn
1957–1960
Disposition
All scrapped
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