LNER Class K4

LNER Class K4
The Great Marquess at Blaenau Ffestiniog, Wales
Type and origin
Power typeSteam
DesignerNigel Gresley
BuilderDarlington Works
Build date1937-1939
Total produced6
Specifications
Configuration:
​
 • Whyte2-6-0
Gauge4 ft 8+1⁄2 in (1,435 mm) standard gauge
Driver dia.5 ft 2 in (1.575 m)
Loco weight68.4 long tons (69.5 t; 76.6 short tons)
Tender weight44.2 long tons (44.9 t; 49.5 short tons)
Fuel typeCoal
Boiler pressure200 psi (1.38 MPa)
Cylinders3 (two outside, one inside)
Cylinder size18.5 in × 26 in (470 mm × 660 mm)
Valve gear
Performance figures
Tractive effort36,600 lbf (162.80 kN)
Career
Power class5P6F
Numbers
  • LNER (Pre 1946): 3441-3446
  • LNER (Post 1946) 1993-1998
  • BR: 61993-61998
Withdrawn1961
DispositionOne preserved, remainder scrapped

The London and North Eastern Railway (LNER) Class K4 is a class of 2-6-0 steam locomotives designed by Nigel Gresley for the steep grades of the West Highland Line.

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