The film is about a mail delivery service that runs via railway from around the UK. It is a poetic documentary that is used to advertise the efficiency of the railway messenger service. It is in poetic mode due to the poem read out at the end that symbolises the usefulness of the train, and throughout the rest of the film the inner-workings of the railway and postal service is shown to display why it is an effective business. The poem is done to describe the efficiency of the service through a light-hearted and flowing prose.
Finley Cairns A-Level Film Studies Blog 
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