NBR Class M 4-4-0
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| Type and origin | |
|---|---|
| Power type | Steam |
| Designer | Matthew Holmes |
| Builder | North British Railway (Cowlairs) |
| Build date | 1884-1899 Rebuilt 1918-1922 |
| Total produced | 48 (60 including D27 & D28 types) |
| Specifications | |
|---|---|
| Configuration: |
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| • Whyte | 4-4-0 |
| Gauge | 4 ft 8 1⁄2 in (1,435 mm) |
| Leading dia. | 3 ft 6 in (1.07 m) |
| Coupled dia. | 6 ft 6 in (1.98 m) |
| Length | 22 ft 1 in (6.73 m) (engine only) 43 ft 4 in (13.21 m) (engine & tender) |
| Loco weight | 46.4 long tons (47.1 t) |
| Fuel type | coal |
| Firebox: • Firegrate area |
19.47 square feet |
| Boiler pressure | 175 psi (1.21 MPa) |
| Cylinders | two inside |
| Cylinder size | 18 1⁄4 in × 26 in (460 mm × 660 mm) |
| Performance figures | |
|---|---|
| Tractive effort | 16,514 lbf (73.46 kN) |
| Career | |
|---|---|
| Power class | BR: 2P |
| Withdrawn | 1933-1952 |
| Disposition | All scrapped |
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| Type and origin | |
|---|---|
| Power type | Steam |
| Designer | Dugald Drummond |
| Builder | Neilson & Co (2 batches) North British Railway (1 batch) |
| Build date | 1877-1879 Rebuilt 1902-1904 |
| Total produced | 12 (60 including D31 type) |
| Specifications | |
|---|---|
| Configuration: |
|
| • Whyte | 4-4-0 |
| Gauge | 4 ft 8 1⁄2 in (1,435 mm) |
| Leading dia. | 3 ft 6 in (1.07 m) |
| Coupled dia. | 6 ft 6 in (1.98 m) |
| Length | 22 ft 1 in (6.73 m) (engine only) 42 ft 9 in (13.03 m) (engine & tender) |
| Loco weight | 46.6 long tons (47.3 t) |
| Fuel type | coal |
| Firebox: • Firegrate area |
20 square feet |
| Boiler pressure | 175 psi (1.21 MPa) |
| Cylinders | two inside |
| Cylinder size | 18 1⁄4 in × 26 in (460 mm × 660 mm) |
| Performance figures | |
|---|---|
| Tractive effort | 16,514 lbf (73.46 kN) |
| Career | |
|---|---|
| Nicknames | Abbotsford |
| Withdrawn | 1921-1926 |
| Disposition | All scrapped |
The NBR Class M (later LNER Class D31) was a class of 4-4-0 steam locomotive of the North British Railway. The class was created during the tenures of William P. Reid (Locomotive Superintendent) and Walter Chalmers (Chief Draughtsman) by rebuilding three earlier types, the "574", "633", and "729", which had all been designed by Matthew Holmes, and shared many features in common. A total of 48 were produced.
The NBR Class M (later LNER Class D27 & D28) was an older but very similar type of 4-4-0 locomotive, commonly known as the Abbotsford class, and a pioneering 4-4-0 design by Dugald Drummond. A total of 12 were produced. The engines were rebuilt (6 in 1902 and 6 in 1904) to become almost exact copies of the D31 engines. The only visible differences between the 1902 (D27) and 1904 (D28) designs were slight differences to the cab doors and windows.
Although both the Holmes and the Drummond engines were included in the class M designation when the NBR adopted formal class designations in 1913, the LNER did not consider the locomotives to be of the same class, and in 1923 (on grouping) the Holmes M class became LNER class D31, whilst the two types of Abbotsfords became LNER classes D27 and D28.
The D31 type locomotives all passed to the London and North Eastern Railway in 1923 but one was withdrawn in 1931, and general withdrawals began in 1933, with only seven of the class passing to British Railways in 1948.
The D27 & D28 type locomotives were withdrawn earlier. Five were scrapped pre-grouping, although the other seven passed to the London and North Eastern Railway in 1923. All were withdrawn by 1926, with none passing to British Railways at nationalisation.
The common nickname "Abbotsfords" for the D27 and D28 locomotives is derived from the name of engine 479 (the fourth built). This engine was used in publicity photographs at the Cowlairs works when the locomotives were built, and these publicity photographs are believed to be the origins of the nickname.
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