Ambitious, inventive and instantly recognisable, Night Mail tells the fascinating story of the Post Office train from London to Scotland and the men who worked on it.
The sequence with Benjamin Britten's innovative score and verse by WH Auden timed to the rhythms of the train is one of the most lyrical in the history of documentary film.
DVD extras include The Way to the Sea (verse by Auden, score by Britten), Spotlight on Night Mail (1948), Thirty Million Letters (1962), Night Mail 2 (1986) and fully illustrated booklet.