Bulletin No:3

The Bulletin concerned the 'performance and efficiency testing' of a LM Region Class 4, 2-cylinder 2-6-0 Mixed Traffic Locomotive number 43094.  This loco had been designed by the LMS but built by BR and had a single chimney unlike the earlier designs.

The tests were undertaken to establish the following:

bulletThe price in terms of coal and water of hauling different train loads and different speeds over given routes
bulletAn indication of the level of efficiency of the locomotive
bulletMeans of comparing one locomotive with another on a common basis

Testing was undertaken on the static test plant at Swindon and on the line between Challow and Stoke Gifford (Bristol Parkway), a distance of approx 50 miles.

Here is a summary of the tests and a picture

Pictures are credited where known.

No:43094 pictured approaching Swindon with a train of 11 coaches and the ex-GWR Dynamometer car No:7 (340 tons behind the drawbar).
The BR loco diagram for the Class 4
The results show a maximum HP of around 500

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