NBR Class M 4-4-0

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NBR Class M
LNER Class D31
Type and origin
Power type Steam
Designer Matthew Holmes
Build date built 1884-1899
rebuilt 1918-1922
Configuration 4-4-0
Gauge 4 ft 8 12 in (1,435 mm)
Driver diameter 6 ft 6 in (1.98 m)
Locomotive weight 46.4 long tons (47.1 t)
Fuel type coal
Boiler pressure 175 psi (1.21 MPa)
Cylinders two inside
Cylinder size 18 14 in × 26 in (460 mm × 660 mm)
Performance figures
Tractive effort 16,515 lbf (73.46 kN)
Power class BR: 2P
Disposition All scrapped

The NBR Class M was a class of 4-4-0 steam locomotive of the North British Railway. The class was rebuilt during the tenures of William P. Reid and Walter Chalmers from three earlier classes, the "574", "633", and "729" which had been designed by Matthew Holmes.

The locomotives passed to the London and North Eastern Railway in 1923 but withdrawals began in 1931 and only seven of the class passed to British Railways in 1948.


British Railways numbers were 62059, 62060, 62062, 62064, 62065, 62066, 62072.


The last D31 was withdrawn in 1952 and none was preserved.


  • Ian Allan ABC of British Railways Locomotives, 1948 edition, part 4, page 18

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