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A mark applied to mail sorted aboard a train.
Also known as: Travelling post office marking, TPO marking, Sorting carriage mark
A railway post office marking identifies mail sorted in a travelling post office aboard a train, naming the route rather than a fixed office.
Identifies mail sorted aboard a travelling post office on a railway route.
Contexts: History
Names a route rather than a place, which is the only class of postal marking whose origin is a line on a map instead of a point.
Contexts: History
A dated circular handstamp whose letters name the route between two towns rather than a single place of posting.