One of the last Royal Mail Travelling Post Offices(TPO's)where the mail was sorted on the train between London and Carlisle.a UK

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christopher jones / Alamy Stock Photo
One of the last Royal Mail "Travelling Post Offices" (TPO), the "North West Down" service, which transported and sorted the mail while travelling overnight from north London to Carlisle, stopping only in Rugby and Warrington. The service was scrapped in early 2003, after 150 years.
Location: London-Carlisle, United Kingdom.