| NER 1001 Class | |
| Powertype: | Steam |
| Builddate: | 1852-1875 |
| Retiredate: | all retired by 1923 |
| Builder: | NER Darlington and Shildon |
| Totalproduction: | 192 |
| Wheelbase: | 11inchesft10inchesin (ftin) locomotive 11inchesft0inchesin (ftin) tender 36inchesft2inchesin (ftin) total |
| Driverdiameter: | 5feet |
| Whytetype: | 0-6-0 |
| Cylindercount: | 2 (inside) |
| Cylindersize: | 17x |
| Valvegear: | Stephenson |
| Fueltype: | Coal |
| Watercap: | 1600impgal |
| Boiler: | 4inchesft3inchesin (ftin) diameter |
| Boilerpressure: | 140psi |
| Totalsurface: | 1321.75square feet |
| Fireboxarea: | 92.5square feet |
| Tubearea: | 1229.25square feet |
| Firearea: | 13.3square feet |
| Tractiveeffort: | 14750lbf |
| Locoweight: | 35.2LT |
| Tenderweight: | 22.1LT |
| Locotenderweight: | 57.3LT |
| Axleload: | 14.1LT |
| Operator: | North Eastern Railway London & North Eastern Railway |
| Disposition: | 1 preserved (No. 1275), remainder scrapped |
The North Eastern Railway (NER) 1001 Class was a class of long-boiler 0-6-0 steam locomotive originally designed by William Bouch for the Stockton and Darlington Railway.
A NER 1001 class locomotive weighed about 35LT, with a wheelbase of 11feet and 5feet diameter driven wheels. Its 4feet diameter boiler produced over 7LT of tractive effort at 140psi.
The "long boiler" design dated back to a Stephenson design of 1842. At that time there was a controversy about keeping the centre of gravity low. Another point of view was espoused by John Gray who set out to improve efficiency and increase the pressure in shorter boilers using single drivers instead of coupled wheels. His ideas led to the design of the highly successful Jenny Lind locomotive.
The long boiler design with coupled wheels continued for slower heavier work. A total of 192 NER 1001 class locomotives were built from 1852 by a number of private manufacturers, as well as the NER's own works at Darlington and Shildon.
The small size of the firebox would seem remarkable in later years, but the engines were ideal where trains might spend long periods standing, waiting for a path, or when shunting. A minimum amount of fuel would have delivered sufficient heat to the large boiler to start heavy loads.
The last ten NER 1001s were delivered in 1875. Many were rebuilt in the following twenty five years. The last was withdrawn in 1923.
Having travelled an official mileage of 908984miles, locomotive number 1275 is preserved at the National Railway Museum in York.