NER Class R1
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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.[1]
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They were withdrawn between 1942 and 1946 and none is preserved.