GWR 3100 Class

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