In this programme, which was filmed in July 1998, locomotives 31 207 + 31 308 are given a thorough workout over the Chilterns with a trailing load of 1,648 tonnes.
The climb to the summit at Saunderton is through Denham and Beaconsfield to High Wycombe.
From there a series of double curves coupled with a stiff gradient has the 40-year old Type 2 veterans at full bore for the remaining six miles to the summit.
After that, the line drops sharply down to Princes Risborough where the 31s take the scenic single line route through Little Kimble to Aylesbury.
From there the train continues over the former Great Central route which is now a single track freight-only line to Claydon Junction.
Shortly after Quainton Road station, the train's progress is halted when a herd of sheep escape from their field and onto the line in front of the train - causing the driver to perform an emergency stop! Despite the valiant efforts of the train crew who do their best to usher the sheep off the line, the animals are hemmed in by the lineside fences. In the end the Class 31s themselves have to gently cajole the sheep all the way to Calvert! It's an extraordinary end to a fascinating journey.
This programme has been completely re-edited from scratch and features additional scenes not included in the original VHS version.