37509 passes Islip on 20 December 1997 with the 6V46 07:05 Daw Mil to MoD Bicester coal. The requirement for these 'as required' trains for supplying the army camp's boiler house heating system, continued into the new millennium, although latterly usually Class 58 hauled. This view has changed completely in recent years, with massive vegetation clearance, and the replacement of this single track of bullhead rails with a double track mainline.