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Specifications
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)

Type and origin
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

GWR 3100 Class
GWR 3100 Class
Power type
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
Configuration:;
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)
Tractive effort
Performance figures
Tractive effort	31,170 lbf (138.7 kN)
Operators
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

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

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.

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.