The encyclopedia · Strategy & Leadership · Operational decision · 1838-2004
The Travelling Post Office sorted letters while the train moved
Britain put postal workers in a moving train car so mail was sorted between stops, not delayed waiting to be sorted.
Royal Mail
the move
Britain's post moved by road and rail, but the real delay was not speed between towns. A letter had to be collected at one office, carried, and then sorted again before onward travel, and each sorting stop added idle time. As the railway grew, the mail was moved more quickly between places but still sat at each one.
In January 1838 mail was first sorted on a moving train, on the Grand Junction Railway, in a converted horse-box. The idea came from Frederick Karstadt, a General Post Office surveyor. Rather than stopping the flow to sort, staff sorted continuously in the carriage and picked up and dropped off mail pouches without the train halting.
The travelling sorting office became the Travelling Post Office. It ran night trains between London and the main cities, with staff passing mail from wagon to wagon; the service grew to more than 130 routes by the time of the First World War. A mail train could collect, sort and re-dispatch mail overnight across the country.
The TPO lasted more than 160 years, until the final journeys on 9 January 2004. Royal Mail moved the work to automated machines and road and air transport, but the underlying idea — do the sorting where the thing already has to go — remained the reason it had been so effective.
why it works
- Sorting at each stop added idle time that the journey itself never used
- Putting staff in the moving car overlapped sorting with travel
- Mail pouches could be exchanged while the train kept moving
- The service handled mail overnight across hundreds of miles
what transfers
If a task must be done on every leg of a journey, do it in transit; overlap the wait with the move instead of queueing work at endpoints.
what came after
The Travelling Post Office became a fixture of British rail for over 160 years, running more than 130 routes by the First World War. It survived until 2004, when automated sorting machines and road and air transport replaced it, but the durable lesson — process work while it is in motion — survived into modern logistics that sort parcels as they move through a network.
references
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