Constructed at Crewe Works in 1954, No. 71000 was the final attempt by BR to design a three cylindered Pacific, based on the successful lines of the 'Britannia' class.
This locomotive profile traces its beginnings and its short career of just eight years on the West Coast Main Line for BR.
But our story really starts with its incredible survival in South Wales, at the famous scrapyard at Barry.
Devoid of many of its main components, the Duke is seen at its darkest moment, rusting away by the seaside.
By 1974 help was on the horizon in the form of The 71000 Duke of Gloucester Locomotive Trust who managed to purchase the engine and see it transferred to the fledgling Great Central Railway scheme.
We see footage of this rescue and of the early years of restoration at Loughborough.
Extensive sequences of its return to steam are included, with an in-depth review of its first main line runs all over the UK.
The programme picks up the story in the early 21st century at Bury on the East Lancs Railway where the Duke was undergoing a huge overhaul for its second term out on the main lines.
Sequences of its first move under steam and of its very first run on the Lancashire line begin to trace the start of the new main line ticket.
The locomotive's first run to Holyhead is covered, as too is the triumphant run over Shap and the Settle - Carlisle in September 2004.