With the station clock reading 15.50 55004 'Queen's Own Highlander'

and its train is being prepared to leave in fifteen minutes with the 16.05 semi-fast service to York composed of six air conditioned Mk. IIs and what I assume to be a Mk. 1 buffet or restaurant car marshalled towards the middle. With a haze of diesel fumes appearing to be coming from just one of the exhausts, it would appear that 55004 will be hauling the train with just 1,650hp on tap on one engine. This was a very common occurrence in the last years of Deltic operation to keep these fine machines in service by helping to reduce engine hours and thus preserving the number of 'spare' units available to be swapped over at 'the Plant' in Doncaster. This would be ample power for this train to maintain its tight timings on this late afternoon commuter service to York.