Night Mail is a 1936 British documentary produced by the General Post Office Film Unit about the overnight postal train from London to Scotland. Its celebrated closing sequence combines railway imagery with verse by W. H. Auden and music by Benjamin Britten, shaped around the train’s accelerating rhythm. The opening words of the poem became the film’s most recognizable passage. The clip remains useful online because its strong cadence, vintage documentary tone, and journey-focused wording fit railway videos, travel montages, delivery jokes, and historical edits.