GWR 5100 Class

Specifications
Specifications
Configuration:;
• Whyte	2-6-2T
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Leading dia.	3 ft 2 in (0.965 m)
Driver dia.	5 ft 8 in (1.727 m)
Trailing dia.	3 ft 8 in (1.118 m)
Length	41 ft 0 in (12.50 m) over buffers
Loco weight	75 long tons 10 cwt (169,100 lb or 76.7 t); (76.7 t; 84.6 short tons) full
Fuel type	Coal
Water cap.	2,000 imp gal (9,100 L; 2,400 US gal)
Boiler	GWR Standard No. 2
Boiler pressure	200 lbf/in2 (1.38 MPa)
Heating surface:
• Firebox	122 sq ft (11.3 m2)
• Tubes	1,144 sq ft (106.3 m2)
Cylinders	Two, outside
Cylinder size	18+1⁄2 in × 30 in (470 mm × 762 mm)
Valve gear	Stephenson
Valve type	Piston valves
Train brakes	Vacuum

Type and origin
Type and origin
Power type	Steam
Designer	George Jackson Churchward
Builder	GWR Swindon Works
Order number	Lots 140, 150, 152, 159
Serial number	1992, 2066–2075, 2086–2096, 2138–2156
Build date	1903
Total produced	40

GWR 5100 Class
GWR 5100 Class
	GWR 3120 Prairie locomotive in as built condition (Howden, Boys' Book of Locomotives, 1907)
Power type
Type and origin
Power type	Steam
Designer	George Jackson Churchward
Builder	GWR Swindon Works
Order number	Lots 140, 150, 152, 159
Serial number	1992, 2066–2075, 2086–2096, 2138–2156
Build date	1903
Total produced	40
Configuration:;
Specifications
Configuration:;
• Whyte	2-6-2T
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Leading dia.	3 ft 2 in (0.965 m)
Driver dia.	5 ft 8 in (1.727 m)
Trailing dia.	3 ft 8 in (1.118 m)
Length	41 ft 0 in (12.50 m) over buffers
Loco weight	75 long tons 10 cwt (169,100 lb or 76.7 t); (76.7 t; 84.6 short tons) full
Fuel type	Coal
Water cap.	2,000 imp gal (9,100 L; 2,400 US gal)
Boiler	GWR Standard No. 2
Boiler pressure	200 lbf/in2 (1.38 MPa)
Heating surface:
• Firebox	122 sq ft (11.3 m2)
• Tubes	1,144 sq ft (106.3 m2)
Cylinders	Two, outside
Cylinder size	18+1⁄2 in × 30 in (470 mm × 762 mm)
Valve gear	Stephenson
Valve type	Piston valves
Train brakes	Vacuum
Tractive effort
Performance figures
Tractive effort	5100: 25,670 lbf (114.2 kN) ; 8100: 28,000 lbf (120 kN)
Power class
Career
Power class	4MT
Number in class	40
Numbers	3100, 3111-3149; later 5100, 5111-5149
First run	1903

The Great Western Railway (GWR) GWR 5100 Class (known as the 3100 class between 1912 and 1927) was a class of 2-6-2T side tank steam locomotives. It was the first of a series of broadly similar classes used principally for suburban passenger services.

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