NBR Class M 4-4-0
|NBR Class M
LNER Class D31
|Type and origin|
|Build date||built 1884-1899
|Gauge||4 ft 8 1⁄2 in (1,435 mm)|
|Driver diameter||6 ft 6 in (1.98 m)|
|Locomotive weight||46.4 long tons (47.1 t)|
|Boiler pressure||175 psi (1.21 MPa)|
|Cylinder size||18 1⁄4 in × 26 in (460 mm × 660 mm)|
|Tractive effort||16,515 lbf (73.46 kN)|
|Power class||BR: 2P|
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.
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The last D31 was withdrawn in 1952 and none was preserved.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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