Best known as the vehicle that recorded the 126mph run of LNER ‘A4’ No. 4468 Mallard  on July 3rd 1938, the North Eastern Railway’s test car, built at Darlington Works in 1906, is now on display at the National Railway Museum, where it has been reunited with Mallard.
A Dynamometer Car scientifically measures the performance of locomotives in order to effect improvements. Inside, instruments measure the speed, power and other statistics of locomotive performance, many of which were applied to a paper trace operated mechanically from the movement of the vehicle. The NER’s vehicle was also equipped with a drop-down bed hanging in the ceiling for operators to sleep in. It was also fitted with equipment to allow operators to speak to the driver.
No. 23591 passed into LNER ownership after the Grouping of 1923 where Chief Mechanical Engineer Sir Nigel Gresley used it extensively to test his new designs and modifications against established locomotives. It was even used behind the UK’s only steam-diesel hybrid locomotive!
The Dynamometer car and its paper trace recorded Mallard’s top speed of 126mph on Stoke Bank in 1938. The vehicle eventually passed into British Railway ownership and continued to be used for scientific testing including the famous 1948 Locomotive Exchange Trials. The Dynamometer Car is now preserved as part of the National Collection at the NRM in York.
With permission from Rails of Sheffield, we have produced a second production run of the award-winning LNER Dynamometer Car No. 23591. This second batch covers three previously unavailable new liveries.
Based on detailed research of the prototype, archive photographs and official drawings, this model features exceptional interior and underframe detail, including depictions of the recording equipment and the additional speed recording wheel between the bogies. No wonder it was voted by the readers of Model Rail magazine as ‘Coach of the Decade’ in its Model of the Decade awards!
We’re producing three new versions, two of which have never been produced before:
No. 23591 represents it as it was between 1928 and 1938, and in its teak finish with lining. This model covers the famous record-breaking run of 126MPH, which was achieved by Mallard. Of course, this wasn’t the Dynamometer Car’s only claim to fame, so, to represent its busy and well-travelled life, we have produced two further variants in liveries it received in the following years. Â
No. 902502 in post-1946 LNER teak with lining, and carrying its later number – No. 902502, as seen during the famous 1948 Locomotive Interchange trials.
No. E902502, in British Railways faux teak finish, and BR Gill Sans lettering. This livery was applied in 1949 and can be seen when the Dynamometer Car was used on trials with Bulleid’s famous ‘Leader’ locomotive.
Whilst the original model may have been award-winning Rapido are always striving to improve our models and this batch features improved decoration, including adding the correct lining, amended roof colours, improved lettering and a whole new livery.
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Notice: We have issued a recall for these products : Please see HERE for more information.