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In page Rail transport in Great Britain:

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A symbolic loss to the rail freight industry in Great Britain was the custom of the Royal Mail, which from 2004 discontinued use of its 49-train fleet, and switched to road haulage after a near 170-year-preference for trains. Mail trains had long been part of the tradition of the railways in Great Britain, famously celebrated in the film Night Mail, for which W. H. Auden wrote the poem of the same name. Although Royal Mail suspended mail trains in January 2004, this decision was reversed in December of the same year, and Class 325s are now used on some routes including between London, Warrington and Scotland.[citation needed]