The tests were undertaken to establish the following:
 | The price in terms of coal and water of hauling different train loads and different speeds over given routes |
| An indication of the level of efficiency of the locomotive |
| Means 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 Carlisle and Skipton, the main testing taking place between Appleby and Dent, a distance of approx 25 miles.
Here is a summary of the tests and a few pictures.
