| NBR Class M LNER Class D31 |
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|---|---|
| Power type | Steam |
| Designer | Matthew Holmes |
| Build date | built 1884-1899 rebuilt 1918-1922 |
| Configuration | 4-4-0 |
| 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) |
| Fuel type | coal |
| Boiler pressure | 175 psi (1.21 MPa) |
| Cylinders | two inside |
| Cylinder size | 181⁄4 × 26 in (460 × 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.
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.
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British Railways numbers were 62059, 62060, 62062, 62064, 62065, 62066, 62072.
The last D31 was withdrawn in 1952 and none was preserved.
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