| NBR K Class LNER Class D26/D32/D33/D34 |
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| Power type | Steam |
| Designer | D26, Matthew Holmes D32/D33/D34, William P. Reid |
| Builder | NBR Cowlairs works |
| Build date | 1903-1920 |
| Total produced | 68 |
| Configuration | 4-4-0 |
| Gauge | 4 ft 8 1⁄2 in (1,435 mm) |
| Leading wheel diameter |
3 ft 6 in (1.07 m) |
| Driver diameter | D26, 6 ft 6 in (1.98 m) D32/D33/D34, 6 ft (1.8 m) |
| Locomotive weight | D26, 52 long tons (53 t) D32/1, 53 long tons (54 t) D32/2, 53.7 long tons (54.6 t) D33, 54.05 long tons (54.92 t) D34, 57.2 long tons (58.1 t) |
| Tender weight | D26/D32, 40 long tons (41 t) D33, 44.6 long tons (45.3 t) D34, 46.65 long tons (47.40 t) |
| Fuel type | coal |
| Boiler pressure | D26/D32/1/D33, 190 psi (1,300 kPa) D32/2/D34, 180 psi (1,200 kPa) |
| Cylinders | two inside |
| Cylinder size | D26/D32/D33, 19 × 26 in (480 × 660 mm) D34, 20 × 26 in (510 × 660 mm) |
| Tractive effort | D26, 19,434 lbf (86.45 kN) D32/1/D33, 21,053 lbf (93.65 kN) D32/2, 19,945 lbf (88.72 kN) D34, 22,100 lbf (98 kN) |
| Power class | BR: 3P (except D26) |
The NBR K Class is a class of 4-4-0 steam locomotive of the North British Railway. The first batch (later LNER Class D26) was designed by Matthew Holmes in 1902 and had 6' 6" driving wheels for express passenger work. Three more batches (later LNER Classes D32/D33/D34) were designed by William P. Reid with 6' 0" driving wheels for mixed traffic work. This included perishable goods, such as fish from Mallaig and Aberdeen. They had inside cylinders and Stephenson valve gear. Later locomotives had superheaters.
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The LNER divided the NBR K Class into four sub-classes:
Twelve engines ordered in March 1902 and built at Cowlairs railway works in 1903. Three were withdrawn in 1922, leaving nine to enter LNER ownership in 1923. These nine had all been withdrawn by July 1926.[1]
Twelve engines ordered in 1905 and built at Cowlairs in 1906-7. The LNER began to fit superheated boilers in 1923 and classified the superheated locomotives D32/2. The non-superheated locomotives were classified D32/1.[2]
Twelve engines built at Cowlairs in 1909-10. The LNER fitted superheaters to all the D33s between 1925 and 1936.[3]
Ten engines built at Cowlairs in 1913. Twenty-two engines built between 1917 and 1920. All the D34s were built with superheaters.[4]
The locomotives passed to the London and North Eastern Railway (LNER) in 1923 and, some of them, to British Railways (BR) in 1948. BR numbers [5] were:
The D34s were named after Scottish Glens:
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Withdrawals began in 1946 and all the D34s had been withdrawn by 1961. One, 256 Glen Douglas (BR number 62469) has been preserved by the Scottish Railway Preservation Society.
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