GNR Class C1 (large boiler)

Specifications
Specifications
Configuration:;
• Whyte	4-4-2
• UIC	2′B1
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Leading dia.	3 ft 8 in (1.118 m)
Driver dia.	6 ft 8 in (2.032 m)
Trailing dia.	3 ft 8 in (1.118 m)
Wheelbase	48 ft 5.5 in (14.77 m)
Axle load	20 long tons (20 t; 22 short tons)
Adhesive weight	40 long tons (41 t; 45 short tons)
Loco weight	69.6 long tons (70.7 t; 78.0 short tons)
Tender weight	43.1 long tons (43.8 t; 48.3 short tons)
Total weight	112.7 long tons (114.5 t; 126.2 short tons)
Tender type	Class B
Fuel type	Coal
Fuel capacity	6.5 long tons (6.6 t; 7.3 short tons)
Water cap.	3,500 imperial gallons (15,911 L; 4,203 US gal)
Boiler pressure	170 psi (1.2 MPa) (Saturated); 150 psi (1.0 MPa) (Superheated); 200 psi (1.4 MPa) (3292 & 1300);
Cylinders	Two, outside (Majority), Four (2 outside + 2 inside) on No. 3292 Compound & 3279
Cylinder size	19 in × 24 in (483 mm × 610 mm); or 20 in × 24 in (508 mm × 610 mm) (Majority),; 13 in × 20 in (330 mm × 508 mm) (high pressure cylinders on compound); 16 in × 26 in (406 mm × 660 mm) (low pressure cylinders on compound),; 15 in × 26 in (381 mm × 660 mm) (No. 3279); 20 in × 26 in (508 mm × 660 mm) (No. 1300);
Valve gear	Stephenson
Valve type	Slide valves; or 8-inch (203 mm) piston valves (10-inch (254 mm) on 1300)

Type and origin
Type and origin
Power type	Steam
Designer	Henry Ivatt
Builder	Doncaster Works
Build date	1902–1910
Total produced	94

Great Northern Railway large boiler class C1
London & North Eastern Railway class C1
Great Northern Railway large boiler class C1; London & North Eastern Railway class C1
	251, when new in photographic grey
Power type
Type and origin
Power type	Steam
Designer	Henry Ivatt
Builder	Doncaster Works
Build date	1902–1910
Total produced	94
Configuration:;
Specifications
Configuration:;
• Whyte	4-4-2
• UIC	2′B1
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Leading dia.	3 ft 8 in (1.118 m)
Driver dia.	6 ft 8 in (2.032 m)
Trailing dia.	3 ft 8 in (1.118 m)
Wheelbase	48 ft 5.5 in (14.77 m)
Axle load	20 long tons (20 t; 22 short tons)
Adhesive weight	40 long tons (41 t; 45 short tons)
Loco weight	69.6 long tons (70.7 t; 78.0 short tons)
Tender weight	43.1 long tons (43.8 t; 48.3 short tons)
Total weight	112.7 long tons (114.5 t; 126.2 short tons)
Tender type	Class B
Fuel type	Coal
Fuel capacity	6.5 long tons (6.6 t; 7.3 short tons)
Water cap.	3,500 imperial gallons (15,911 L; 4,203 US gal)
Boiler pressure	170 psi (1.2 MPa) (Saturated); 150 psi (1.0 MPa) (Superheated); 200 psi (1.4 MPa) (3292 & 1300);
Cylinders	Two, outside (Majority), Four (2 outside + 2 inside) on No. 3292 Compound & 3279
Cylinder size	19 in × 24 in (483 mm × 610 mm); or 20 in × 24 in (508 mm × 610 mm) (Majority),; 13 in × 20 in (330 mm × 508 mm) (high pressure cylinders on compound); 16 in × 26 in (406 mm × 660 mm) (low pressure cylinders on compound),; 15 in × 26 in (381 mm × 660 mm) (No. 3279); 20 in × 26 in (508 mm × 660 mm) (No. 1300);
Valve gear	Stephenson
Valve type	Slide valves; or 8-inch (203 mm) piston valves (10-inch (254 mm) on 1300)
Tractive effort
Performance figures
Tractive effort	between 13,808 lbf (61.4 kN) and 17,340 lbf (77.1 kN) (Majority),; 21,326 lbf (94.9 kN) (3292 compound),; 21,128 lbf (94.0 kN) (3279),; 22,100 lbf (98.3 kN) (1300);
Operators
Career
Operators	Great Northern Railway; → London and North Eastern Railway; → British Railways;
Power class	BR: 2P
Axle load class	LNER: RA: 7
Withdrawn	1944-1950
Disposition	No. 251 preserved at the National Collection, remainder scrapped

The Great Northern Railway (GNR) Class C1 is a type of 4-4-2 steam locomotive. One, ex GNR 251 (later LNER 3251 in 1924, and LNER 2800 in 1946), survives in preservation. Much like their small boiler cousins, they were capable of reaching speeds of up to 90 mph (145 km/h). They were also known as Large Atlantics.