GWR 2900 Class

Specifications
Specifications
Configuration:;
• Whyte	4-6-0 (thirteen examples were built as 4-4-2 but rebuilt to 4-6-0 1912/13).
• UIC	2'Ch2
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Leading dia.	3 ft 2 in (0.965 m)
Driver dia.	6 ft 8+1⁄2 in (2.045 m)
Trailing dia.	4 ft 1+1⁄2 in (1.257 m) (4-4-2 only)
Wheelbase	loco: 27 ft 1 in (8.26 m) – ; 27 ft 7 in (8.41 m); loco & tender:; 53 ft 4+3⁄4 in (16.28 m) –; 53 ft 10+3⁄4 in (16.43 m)
Length	63 ft 0+1⁄4 in (19.21 m)
Width	8 ft 11 in (2.718 m)
Height	13 ft 3+1⁄2 in (4.051 m)
Axle load	18 long tons (18 t; 20 short tons)
Loco weight	68.30 long tons (69.40 t; 76.50 short tons)
Tender weight	43.15 long tons (43.84 t; 48.33 short tons)
Fuel capacity	5 long tons (5.1 t; 5.6 short tons)
Water cap.	3,500 imp gal (16,000 L; 4,200 US gal) – 4,000 imp gal (18,000 L; 4,800 US gal)
Firebox:
• Grate area	27.22 sq ft (2.529 m2)
Boiler	GWR Standard No. 1 (with variations)
Boiler pressure	225 psi (1.55 MPa) (production series)
Heating surface:
• Firebox	154.94 sq ft (14.394 m2)
• Tubes and flues	1,485.96 sq ft (138.050 m2)
Superheater:;
• Type	"Swindon No. 3"
• Heating area	307.52 sq ft (28.570 m2)
Cylinders	Two, outside
Cylinder size	18 in × 30 in (457 mm × 762 mm) or; 18+1⁄2 in × 30 in (470 mm × 762 mm)
Valve gear	Stephenson
Valve type	10 inches (254 mm) piston valves; (2935 rebuilt with poppet valves)

Type and origin
Type and origin
Power type	Steam
Designer	George Jackson Churchward
Builder	GWR Swindon Works
Build date	1902-1913
Total produced	77

Great Western Railway 2900 *Saint* class
Great Western Railway 2900 Saint class
	2981 Ivanhoe at Tilehurst in 1948
Power type
Type and origin
Power type	Steam
Designer	George Jackson Churchward
Builder	GWR Swindon Works
Build date	1902-1913
Total produced	77
Configuration:;
Specifications
Configuration:;
• Whyte	4-6-0 (thirteen examples were built as 4-4-2 but rebuilt to 4-6-0 1912/13).
• UIC	2'Ch2
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Leading dia.	3 ft 2 in (0.965 m)
Driver dia.	6 ft 8+1⁄2 in (2.045 m)
Trailing dia.	4 ft 1+1⁄2 in (1.257 m) (4-4-2 only)
Wheelbase	loco: 27 ft 1 in (8.26 m) – ; 27 ft 7 in (8.41 m); loco & tender:; 53 ft 4+3⁄4 in (16.28 m) –; 53 ft 10+3⁄4 in (16.43 m)
Length	63 ft 0+1⁄4 in (19.21 m)
Width	8 ft 11 in (2.718 m)
Height	13 ft 3+1⁄2 in (4.051 m)
Axle load	18 long tons (18 t; 20 short tons)
Loco weight	68.30 long tons (69.40 t; 76.50 short tons)
Tender weight	43.15 long tons (43.84 t; 48.33 short tons)
Fuel capacity	5 long tons (5.1 t; 5.6 short tons)
Water cap.	3,500 imp gal (16,000 L; 4,200 US gal) – 4,000 imp gal (18,000 L; 4,800 US gal)
Firebox:
• Grate area	27.22 sq ft (2.529 m2)
Boiler	GWR Standard No. 1 (with variations)
Boiler pressure	225 psi (1.55 MPa) (production series)
Heating surface:
• Firebox	154.94 sq ft (14.394 m2)
• Tubes and flues	1,485.96 sq ft (138.050 m2)
Superheater:;
• Type	"Swindon No. 3"
• Heating area	307.52 sq ft (28.570 m2)
Cylinders	Two, outside
Cylinder size	18 in × 30 in (457 mm × 762 mm) or; 18+1⁄2 in × 30 in (470 mm × 762 mm)
Valve gear	Stephenson
Valve type	10 inches (254 mm) piston valves; (2935 rebuilt with poppet valves)
Tractive effort
Performance figures
Tractive effort	20,530 lbf (91.32 kN) – 24,395 lbf (108.51 kN)
Operators
Career
Operators	Great Western Railway; British Railways
Class	2900 or Saint
Power class	GWR: C; BR: 4P
Number in class	76
Numbers	2900–2955, 2971-2990, 2998
Axle load class	GWR: Red
Retired	1924–1953
	One rebuilt as Hall class (2925/4900 Saint Martin), remainder scrapped; One 4900 example has been backdated to 29XX specification

The Great Western Railway 2900 Class or Saint Class, which was built by the Great Western Railway's Swindon Works, incorporated several series of 2-cylinder passenger steam locomotives designed by George Jackson Churchward and built between 1902 and 1913 with differences in the dimensions. The majority of these were built as 4-6-0 locomotives; but thirteen examples were built as 4-4-2 (but converted to 4-6-0 during 1912/13). They proved to be a highly successful class which established the design principles for GWR 2-cylinder classes over the next fifty years, and influenced similar classes on other British railways.