LNER Gresley K4 61994 The Great Marquess

Specifications
Specifications
Configuration:;
• Whyte	2-6-0
• UIC	1′C h3
Gauge	4 ft 8+1⁄2 in (1,435 mm)
Leading dia.	3 ft 2 in (0.965 m)
Driver dia.	5 ft 2 in (1.575 m)
Loco weight	68.4 long tons (69.5 t)
Tender weight	44.2 long tons (44.9 t)
Fuel type	Coal
Fuel capacity	5.50 long tons (5.59 t)
Water cap.	3,700 imperial gallons (17,000 L; 4,400 US gal) (extended water capacity - originally 3,500 imperial gallons (16,000 L; 4,200 US gal)
Firebox:
• Grate area	27+1⁄2 sq ft (2.55 m2)
Boiler pressure	200 psi (1.38 MPa)
Heating surface:
• Firebox	168.0 sq ft (15.61 m2)
• Tubes	781.1 sq ft (72.57 m2)
• Flues	382.5 sq ft (35.54 m2)
• Total surface	1,421.6 sq ft (132.07 m2)
Superheater:;
• Heating area	310 sq ft (29 m2)
Cylinders	Three
Cylinder size	18+1⁄2 in × 26 in (470 mm × 660 mm)
Valve gear	Walschaerts (outside); Gresley Conjugated (inside)
Valve type	Piston valves

Type and origin
Type and origin
Power type	Steam
Designer	Nigel Gresley
Builder	Darlington Works
Build date	July 1938

LNER 3442 *The Great Marquess*
LNER 3442 The Great Marquess
	The Great Marquess at Blaenau Ffestiniog
Power type
Type and origin
Power type	Steam
Designer	Nigel Gresley
Builder	Darlington Works
Build date	July 1938
Configuration:;
Specifications
Configuration:;
• Whyte	2-6-0
• UIC	1′C h3
Gauge	4 ft 8+1⁄2 in (1,435 mm)
Leading dia.	3 ft 2 in (0.965 m)
Driver dia.	5 ft 2 in (1.575 m)
Loco weight	68.4 long tons (69.5 t)
Tender weight	44.2 long tons (44.9 t)
Fuel type	Coal
Fuel capacity	5.50 long tons (5.59 t)
Water cap.	3,700 imperial gallons (17,000 L; 4,400 US gal) (extended water capacity - originally 3,500 imperial gallons (16,000 L; 4,200 US gal)
Firebox:
• Grate area	27+1⁄2 sq ft (2.55 m2)
Boiler pressure	200 psi (1.38 MPa)
Heating surface:
• Firebox	168.0 sq ft (15.61 m2)
• Tubes	781.1 sq ft (72.57 m2)
• Flues	382.5 sq ft (35.54 m2)
• Total surface	1,421.6 sq ft (132.07 m2)
Superheater:;
• Heating area	310 sq ft (29 m2)
Cylinders	Three
Cylinder size	18+1⁄2 in × 26 in (470 mm × 660 mm)
Valve gear	Walschaerts (outside); Gresley Conjugated (inside)
Valve type	Piston valves
Tractive effort
Performance figures
Tractive effort	36,600 lbf (162.80 kN)
Operators
Career
Operators	London and North Eastern Railway; → British Railways;
Class	LNER Class K4
Power class	BR: 6MT
Numbers	LNER: 3442 → 1994; BR: 61994;
Axle load class	BR: Route Availability 6
Withdrawn	December 1961
Current owner	John Cameron
Disposition	Static Display

LNER 3442 The Great Marquess is a member of the London and North Eastern Railway (LNER) Class K4 designed by Nigel Gresley for the steep grades of the West Highland Line. It was renumbered 1994 in the LNER's 1946 renumbering scheme, and then renumbered 61994 by British railways after the 1948 nationalisation of Britain's railways.