A Travelling Post Office (TPO) is a type of mail train where the mail is sorted en-route.
In the United Kingdom, these trains first started operating in 1838. The trains were operated most recently by Rail Express Systems, and their successor EWS. 9 January 2004 saw the last TPO trains operated, after Royal Mail decided not to transport mail by rail.
TPOs were equipped with letter boxes so that mail could be posted whilst the train stood at a station. The post-marks from TPOs are valued by philatelists.
TPO trains are formed of several different types of vehicle. For more information see the following links.
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