NER Dynamometer Car

Built in 1906 by the North Eastern Railway (NER) at Darlington Works, its role was to scientifically measure the performance of trains in order to effect improvements.

It initially ran as number 3591 and was painted in the NER's Crimson Lake livery.

[1] In 1923 it was included in the acquisition of the NER by the LNER, and used extensively by Chief Engineer Nigel Gresley.

It was used in the 1948 Locomotive Exchange Trials by British Railways, and in late 1948 was repainted and renumbered as E902502, still with the imitation teak finish, but unlined.

It largely retains its British Railways paint but with the lettering and numbering altered to their post-war condition.