| NER Class M1/M, Q and Q1 LNER Class D17/1, D17/2 and D18 |
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|---|---|
| Power type | Steam |
| Designer | Wilson Worsdell |
| Builder | NER Gateshead |
| Build date | 1892-1894 (Class M1) 1896-1897 (Class Q) 1896 (Class Q1) |
| Total produced | 20 (Class M1) 30 (Class Q) 2 (Class Q1) |
| Configuration | 4-4-0 |
| Gauge | 1,435 mm (4 ft 8 1⁄2 in) |
| Leading wheel diameter |
3 ft 7 1⁄4 in (1.099 m) |
| Driver diameter | 7 ft 1 1⁄4 in (2.165 m) |
| Wheelbase | 23 ft 6 in (7.16 m) Class M1/Q engine 23 ft 9 in (7.24 m) Class Q1 engine 12 ft 8 in (3.86 m) tender 45 ft 8 1⁄4 in (13.926 m) Class M1/Q total 46 ft 2 3⁄4 in (14.091 m) Class Q1 total |
| Axle load | 18.6 long tons (18.9 t) (Class M1) 18.8 long tons (19.1 t) (Class Q) 19.2 long tons (19.5 t) (Class Q1) |
| Locomotive weight | 52.5 long tons (53.3 t) (Class M1) 50.3 long tons (51.1 t) (Class Q) 53.5 long tons (54.4 t) (Class Q1) |
| Tender weight | 41.2 long tons (41.9 t) |
| Locomotive & tender combined weight |
93.7 long tons (95.2 t) (Class M1) 91.5 long tons (93.0 t) (Class Q) 94.7 long tons (96.2 t) (Class Q1) |
| Boiler | 4 ft 4 in (1.32 m) diameter |
| Boiler pressure | 160 psi (1.1 MPa) |
| Firegrate area | 19.8 sq ft (1.84 m2) |
| Heating surface: Tubes |
479 sq ft (44.5 m2) |
| Heating surface: Flues |
291 sq ft (27.0 m2) |
| Heating surface: Firebox |
123 sq ft (11.4 m2) |
| Heating surface: Total |
1,097 sq ft (101.9 m2) |
| Superheater area | 204 sq ft (19.0 m2) |
| Cylinders | 2 (inside) |
| Cylinder size | 19 × 26 in (480 × 660 mm) 20 × 26 in (510 × 660 mm) (No. 1870) |
| Valve gear | Stephenson |
| Tractive effort | 14,974 lbf (66.61 kN) (Class M1/Q) 13,990 lbf (62.2 kN) (No. 1869) 15,500 lbf (69 kN) (No. 1870) |
| Career | North Eastern Railway, London & North Eastern Railway, British Rail |
| Retired | 1931-1945 (Class M1) 1931-1948 (Class Q) 1930 (Class Q1) |
| Disposition | 1 preserved (No. 1621), 19 scrapped (Class M1) All scrapped (Class Q) Both scrapped (Class Q1) |
The North Eastern Railway Class M1 (LNER Class D17/1) is a class of 4-4-0 steam locomotive, designed by Wilson Worsdell. 20 initial engines were built, then 30 further units were built, designated Class Q (LNER Class D17/2).
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Classification is complex. The NER initially classified these locomotives "M1" while a variant (with compound expansion) was classified "M". The compound was later re-classified "3CC" and the "M1" was re-classified "M".
Under LNER ownership the "M" (formerly "M1") became LNER Class D17/1 and the "3CC" (formerly "M") became LNER Class D19.
This table summarises LNER classes D17, D18 and D19, which were all very similar:
| Original NER class | New NER class | LNER Class | Cylinders | Driving wheels |
|---|---|---|---|---|
| M1 | M | D17/1 | (2) 19" x 26" | 7' 1¼" |
| Q | - | D17/2 | (2) 19½" x 26" | 7' 1¼" |
| Q1 | - | D18 | (2) 19½" x 26" | 7' 7¼" |
| M | 3CC | D19 | HP (1) 19" x 26" LP (2) 20" x 24" |
7' 1¼" |
The last two D17/1s were withdrawn in 1945. Number 1629 was scrapped but number 1621 was saved for preservation.
No D17/1s passed into British Railways ownership. Two D17/2s did (BR numbers 62111 and 62112) but they were withdrawn in February 1948.
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