| NER Class M1/M, Q and Q1 LNER Class D17/1, D17/2 and D18 | |
| Powertype: | Steam |
| Designer: | Wilson Worsdell |
| Builder: | NER Gateshead |
| Builddate: | 1892-1894 (Class M1) 1896-1897 (Class Q) 1896 (Class Q1) |
| Totalproduction: | 20 (Class M1) 30 (Class Q) 2 (Class Q1) |
| Whytetype: | 4-4-0 |
| Uicclass: | 2'Bn2 |
| Length: | Q1 17.145m (56.25feet) |
| Leadingdiameter: | 3feet |
| Driverdiameter: | 7feet |
| Wheelbase: | 23feet Class M1/Q engine 23feet Class Q1 engine 12inchesft8inchesin (ftin) tender 45inchesftNaNinchesin (ftin) Class M1/Q total 46inchesftNaNinchesin (ftin) Class Q1 total |
| Axleload: | M1: 18.6LT Q: 18.8LT Q1: 19.2LT |
| Locoweight: | 52.5LT (Class M1) 50.3LT (Class Q) 53.5LT (Class Q1) |
| Tenderweight: | 41.2LT |
| Locotenderweight: | 93.7LT (Class M1) 91.5LT (Class Q) 94.7LT (Class Q1) |
| Fueltype: | Coal |
| Watercap: | 4125impgal |
| Boiler: | 4feet diameter |
| Boilerpressure: | 1602NaN2 |
| Firearea: | 19.8square feet |
| Tubearea: | 479square feet |
| Fluearea: | 291square feet |
| Fireboxarea: | 123square feet |
| Totalsurface: | 1097square feet |
| Superheaterarea: | 204square feet |
| Cylindercount: | Two, inside |
| Cylindersize: | 19x 20x (No. 1870) |
| Valvegear: | Stephenson |
| Tractiveeffort: | 149742NaN2 (Class M1/Q) 139902NaN2 (No. 1869) 15500lbf (No. 1870) |
| Operator: | North Eastern Railway, London & North Eastern Railway, British Rail |
| Withdrawndate: | 1931–1945 (Class M1) 1931–1948 (Class Q) 1930 (Class Q1) |
| Disposition: | One M1 preserved (No. 1621); remainder M1, Q & Q1 scrapped |
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).
Classification was 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″ × 26″ | 7′ 1¼″ | |
| Q | - | D17/2 | (2) 19½″ × 26″ | 7′ 1¼″ | |
| Q1 | - | D18 | (2) 19½″ × 26″ | 7′ 7¼″ | |
| M | 3CC | D19 | HP (1) 19″ × 26″ LP (2) 20″ × 24″ | 7′ 1¼″ |
See main article: Hull Paragon rail accident.
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.