| Powertype: | Steam |
| NER Class R1 LNER Class D21 | |
| Designer: | Wilson Worsdell |
| Boiler: | 5inchesft6inchesin (ftin) diameter |
| Builder: | NER Gateshead works |
| Builddate: | 1908-1909 |
| Totalproduction: | 10 |
| Whytetype: | 4-4-0 |
| Leadingdiameter: | 3inchesftNaNinchesin (ftin) |
| Driverdiameter: | 6inchesft10inchesin (ftin) |
| Wheelbase: | 23inchesft9inchesin (ftin) engine 12inchesft8inchesin (ftin) tender 45inchesftNaNinchesin (ftin) total |
| Axleload: | 20.8LT |
| Fueltype: | coal |
| Cylindercount: | two inside |
| Cylindersize: | 19inchesx26inchesin (xin) |
| Boilerpressure: | 175psi |
| Tractiveeffort: | 17026lbf |
| Valvegear: | Stephenson |
| Operator: | North Eastern Railway London and North Eastern Railway |
| Retiredate: | 1942-1946 |
| Disposition: | All scrapped |
The NER Class R1 (LNER Class D21) was a class of 4-4-0 steam locomotives of the North Eastern Railway. The class was designed by Wilson Worsdell and built from 1908 to 1909.
The design was similar to that of the NER Class R (LNER Class D20) but a larger boiler was used. Boiler pressure was initially 225psi.
Towards the end of construction the work was to be moved from Gateshead to Darlington Works. However the initial locomotive assembled as Darlington was failed as unfit to drive and subsequent investigations established that the coupling rod centres were not equal, resulting in a change of Works Manager at Darlington.[1]
Boiler pressure was reduced to 180 psi (1.24 MPa) at an unknown date. Superheaters were fitted between 1912 and 1915 and, at the same time, boiler pressure was further reduced to 160psi. It was standard NER practice to reduce boiler pressure when fitting a superheater. At some time before the 1923 Grouping, boiler pressure was increased to 175psi.
The R1s were initially used on the Glasgow-Newcastle and York-Newcastle services. However, as loads increased, they were replaced by more powerful locomotive types (like the class Z) and relegated to secondary duties. By 1924, the Gresley A1s started to arrived in large numbers, which displaced the C7s to many of the secondary duties of the D21s, and in particular, York its entire allocation.
They were withdrawn between 1942 and 1946 and none were preserved.
Although Edward the Blue Engine, from the Railway Series books and its spin-off television series Thomas the Tank Engine & Friends, is regularly described as bearing "a quite striking similarity" to the Furness Railway "Larger Seagulls".[2] Edward is recognisable as an NER Class R1. The Edwardian 4-4-0 type is a fairly common design pattern in British steam locomotives, although at the time of the Seagulls they still had low-set small diameter boilers with tall chimneys. Edward, in particular, differs in having a cab with dual glazed side windows, a much more characteristic feature of North Eastern railway locomotives, the tapered non-circular spectacle plate windows and also the larger boiler diameter and higher boiler line are distinctively those of the NER R1, by then the LNER D21.