A posting on another forum that I frequent took me to a short TV documentary.

Quote: "The poetry of steam and diesel is set into song by radical folk musicians Ewan MacColl and Peggy Seeger in a film that celebrates the Darlington North Road locomen who work around the clock to keep the engines rolling on the railways. This imaginative television documentary, tinged with nostalgia, creates a rich tapestry of actuality and sung narration, heavily influenced by the revolutionary BBC Radio Ballads.

The soundtrack is mostly songs, some re-used from The Ballad of John Axon.