Uploaded on 25 Oct 2011
Part 8 of the 8-part series “The Past at Work”
Written & Presented by Anthony Burton
First broadcast 13th May 1980 (BBC 2)
See also: http://www.bbc.co.uk/archive/steamtrains/7309.shtml and http://www.imdb.com/title/tt1718607/episodes
H/T to Eric Kirkland for the link.