28/10/2026
This image shows the well-furnished interior of the Great Western Railway’s dynamometer car built in 1901 for G J Churchward. It predates the Great Northern Railway’s version in the National Railway Museum, York, which was made in 1906.
As far back as 1841, Isambard Kingdom Brunel was musing on ways of testing locomotive performance by using a special vehicle. By 1848 it was already taking place on the GWR and being talked about in learned papers to professional institutions. In 1856 the GWR Locomotive Superintendent Daniel Gooch made what was called ‘a measuring van’ to test performance with different loads, on challenging gradients and resultant speeds.
The London & North Western Railway produced similar measuring vehicles in 1882 and 1908, and the Lancashire & Yorkshire Railway had versions built in 1896 and 1913. The main purpose of all these vehicles was to measure locomotives’ drawbar pull, and as time went on they developed into more sophisticated travelling laboratories which measured different aspects of locomotives’ performance in terms of inputs such as coal and water and outputs in terms of temperatures, speed, power and waste. With more modern motive power from the late 1960s, there was less need for road testing and these cars ceased to be used.
Image and words: Mike Peart