seat at sorting bench postman's walk frame sorting the walk throwing off postman delivery office Brummy sorting post office sorting frames old sorting office oldtime letter sorting early sorting office adoption of letter boxes for rapid delivery of letters... Victorian posting boxes Victorian postman early parcel sorting Victorian postmen Victorian sorting office 6th May 1840 penny black Sir Rowland Hill prehistoric postman Victorian mail coach old mail coach setting out on delivery Royal Mail Travelling Post Office mail train departing LMS guard whistle mail train in the hills sorting on the TPO TPO sorting frames sorters on the TPO TPO mail bags letters for sorting Alan Johnson on the TPO Suffolk sorting frame mail bag labels TPO brown dust coat attaching pouch on TPO pouch for mail exchange pouch extended on TPO TPO pouch caught in apparatus TPO lineside apparatus mail bag exchange apparatus TPO net it worked!