NER Class R1

NER Class R1
LNER Class D21

Type and origin Power type Steam Designer Wilson Worsdell Builder NER Gateshead works Build date 1908-1909 Total produced 10

Specifications Configuration 4-4-0 Gauge 1,435 mm (4 ft 8 1⁄2 in) Leading dia Driver diameter 6 ft 10 in (2.08 m) Wheelbase 23 ft 9 in (7.24 m) engine 12 ft 8 in (3.86 m) tender total Axle load 20.8 long tons (21.1 t) Fuel type coal Boiler 5 ft 6 in (1.68 m) diameter Boiler pressure 175 psi (1.21 MPa) Cylinders two inside Cylinder size 19 in × 26 in (480 mm × 660 mm) Valve gear Stephenson

Performance figures Tractive effort 17,026 lbf (75.74 kN)

Career Operators North Eastern Railway London and North Eastern Railway Disposition None preserved

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.

Design

The design was similar to that of the NER Class R (LNER Class D20) but a larger boiler was used. Boiler pressure was initially 225 psi (1.55 MPa).

Modifications

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 160 psi (1.1 MPa). 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 175 psi (1.21 MPa).

Use

The R1s were initially used on the Glasgow-Newcastle and York-Newcastle services. However, as train loads increased, they were replaced by more powerful locomotive types and relegated to secondary duties.

Withdrawal

They were withdrawn between 1942 and 1946 and none is preserved.