LNER Class K5

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LNER Class K5
Type and origin
Power type Steam
Designer Edward Thompson
Build date (rebuilt) 1945
Configuration 2-6-0
Gauge 4 ft 8 12 in (1,435 mm)
Driver diameter 5 ft 8 in (1.73 m)
Locomotive weight 71.25 long tons (72.39 t)
Fuel type coal
Boiler pressure 225 psi (1.55 MPa)
Cylinders two outside
Cylinder size 20 in × 26 in (510 mm × 660 mm)
Performance figures
Tractive effort 29,250 lbf (130.1 kN)
Power class BR: 6MT

The London and North Eastern Railway Class K5 consisted of a single rebuild of LNER Class K3 2-6-0 No. 206 (later No. 61863), rebuilt in 1945 by Edward Thompson. The rebuilt locomotive had a new boiler and two, instead of three, cylinders following earlier rebuilds of other Gresley designs. The clear aim of the rebuilds was to move away from the well established three cylinder policy achieving similar results through higher boiler pressure and two larger cylinders. Easier maintenance and greater availability was the objective.


  • Ian Allan ABC of British Railways Locomotives, 1948 edition, part 4, page 17

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