It was also heavier than expected in fuel costs. The efficiency of a gas turbine reduces dramatically at low power outputs so to achieve respectable fuel economy a gas turbine locomotive needs to be operated as much as possible at full power, with periods of part-load running reduced to a minimum. However, it turned out that even on demanding express passenger schedules it was not possible to operate the locomotive on full power for very much of the run and extended periods of part-load operation were inevitable, which resulted in heavy fuel consumption. It was also sometimes fuelled on the much more expensive and scarce light oil normally used only for starting, due to the level of wear caused by the ash from heavy fuel oil.

When reliable operation could be achieved, it did show itself capable of meeting expectations. Unfortunately, however, it was neither possible to achieve an acceptable level of reliability nor to operate it under conditions which would allow reasonable fuel economy.

It is now owned by the Pete Waterman Trust