Today's poem was part of a 1936 British documentary, produced by the General Post Office (GPO) Film Unit to demonstrate the postal system's modernity, and to boost morale of postal workers following the Great Depression. The film, which you can find online, documents the nightly steam train that travels from London to Scotland. The so-called Postal Service train is dedicated to carrying only post, and moves from Euston station in London, to Glasgow, then to Edinburgh and Aberdeen. The film ends with this poem, which vividly captures the quiet drama of the London, Midland and Scottish Railway's Scots Guardsman, touching the lives of so many.  Find out more about the poem's interesting history here.  Now off to write a letter to someone special!