Bulletin No:5

The Bulletin concerned the 'performance and efficiency testing' of a BR Standard Britannia Class 3-cylinder 4-6-2 Mixed Traffic Locomotive number 70005This loco had been built by BR in 1950 and had run only 560 miles before undergoing the tests. The loco completed nearly 7000 miles on the Rugby test plant and about 5000 miles on the road tests.

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 Rugby and on the line between Settle and Carlisle the actual tests being monitored between Lazonby and Crosby Garrett, a distance of approx 25 miles. The amount of coal and water used was carefully monitored, the tender being divided in two such that weighed bags of coal for the test were carried on one side and ordinary loose coal for transit and shunting moves on the other.

Here are a few pictures of the tests and a summary graph.

Pictures are BR official except where credited

No:70005 is put through its paces on the static test plant at Rugby No:70005 about to leave Skipton on 4th June 1951

Alan Rimmer

The BR loco diagram for the Britannia class One of the many test results shows the maximum speed and HP of the loco amongst other things  - note the  maximum power of over 2000HP


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