GWR 3100 Class

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

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 typeSteam
DesignerChurchward
(rebuilt by Collett)
BuilderGWR Swindon Works
Order numberLot 319
Build date1906
Rebuild date1938
Number rebuilt5
Specifications
Configuration:
​
 • Whyte2-6-2T
 • UIC1'C1 h2t
Gauge4 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 curve6 chains (396 ft; 121 m) normal,
5 chains (330 ft; 101 m) slow
Length41 ft 0 in (12.50 m) over buffers
Width8 ft 11+1⁄4 in (2.724 m)
Height13 ft 2 in (4.013 m)
Axle load19 long tons 3 cwt (42,900 lb or 19.5 t)
(21.4 short tons) full
Adhesive weight57 long tons 6 cwt (128,400 lb or 58.2 t)
(64.2 short tons) full
Loco weight81 long tons 9 cwt (182,400 lb or 82.8 t)
(91.2 short tons) full
Fuel typeCoal
Water cap.2,000 imp gal (9,100 L; 2,400 US gal)
Firebox:
 • Firegrate area		20.56 sq ft (1.910 m2)
BoilerGWR Standard No. 4
Boiler pressure225 lbf/in2 (1.55 MPa)
Heating surface:
 • Tubes		1,349 sq ft (125.3 m2)
 • Firebox128.72 sq ft (11.958 m2)
Superheater:
​
 • Type4-element or 6-element
 • Heating area4-element: 136.64 sq ft (12.694 m2),
6-element: 181.10 sq ft (16.825 m2)
CylindersTwo, outside
Cylinder size18.5 in × 30 in (470 mm × 762 mm)
Performance figures
Tractive effort31,170 lbf (138.7 kN)
Career
OperatorsGWR » BR
Class3100
Power classGWR: D,
BR: 4MT
Numbers3100–3104
Axle load classGWR: Red
Withdrawn1957–1960
DispositionAll scrapped

History

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 psi (1,550 kPa). and using smaller coupled wheels of 5 feet 3 inches (1.600 m) diameter, and one-half inch (13 mm) increase in cylinder diameter, nominal tractive effort rose to 31,170 pounds (14,140 kg). Almost impossible to pick out was a 2 in (50.8 mm) reduction in pony truck wheel diameter to 3 ft 0 in (914 mm). 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

References
  • Whitehurst, Brian (1973). Great Western Engines, Names, Numbers, Types and Classes (1940 to Preservation). Oxford, UK: Oxford Publishing Company. pp. 30, 102, 135. ISBN 978-0-9028-8821-0. OCLC 815661.
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