GWR King No 6004 King George III crosses Rumney River bridge on the northern edge of Cardiff with the 7.20pm Cardiff to Crewe mail on 17 May 1962. By the summer of 1961, the Canton diagrams were revised and took a King only as far as Pontypool Road with the 7.20pm, then from Pontypool Road to Shrewsbury with the 12 noon ex-Penzance, and back with the following day's 2.25pm

Peter Kerslake adds " 6004 " King George III " was one of six of her class transferred to Cardifff Canton from Old Oak Common in September 1960, with 6024 following twelve months later.
The reign of the" Kings " at Canton was shortlived, however, in was what was to be their final role with most being withdrawn a few years later and 6004 being condemned in September 1962.
This view shows the Travelling Post Office leading the formation of stock, with its apparatus for dropping and collecting mail bags whilst on the move in the stowed position "


Photo: R.O. Tuck/Rail Archive Stephenson