This series relates to the conveyance of mail on the railways. In the latter half of the 19th century railway mail services were known as Travelling Post Offices and sorting tenders. During the early 19th century sorting tenders became known as sorting carriages. In general terminology sorting carriages were also often referred to as TPOs. The railway mail service also included bag duties or tenders. TPOs and sorting carriages comprised either special trains run exclusively for conveyance and sorting of mails or carriages on passenger trains hired to convey and sort mails. Bag duties were run solely for transportation of mails.
This series includes papers on the mail bag exchange apparatus, TPO mail circulation and sorting lists, railway rolling stock lists and diagrams, schedules of TPO services, minutes of the TPO Whitley Sub-Committee and files on TPO staffing, during railway strikes and after service alterations.
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