A set of 6 postcards was produced by The Postal Museum to coincide with the issue of the Post and Go 'Mail by Rail' stamps. As such, the cards were not 'produced and for sale well in advance of the stamp sale', although they were not produced specifically for the Post and Go Issue.
1. Artwork from the leaflet The Travelling Post Office (1936), with Bag-exchange Apparatus stamp, and Penrith postmark.
Internal poster advertising the need for good timekeeping (1962), with
TPO On The Move stamp, and Station Road, York, postmark.
Artwork for a poster (1939) showing the Post Office London Underground
Railway, with stamp showing similar view, postmarked Underground Mail
Rail London WC1
3. A poster for the film Night Mail (1939), with stamp showing the same design, and Royal Mail Street Birmingham postmark showing Bag-exchange Apparatus.
4. Euston Station: Loading the Travelling Post Office (1948), with stamp showing the same design, and Royal Mail Heritage postmark showing TPO carriage.
5. Travelling Post Office (1935) showing onboard sorting, with stamp of similar design, and Penrith postmark.
We don't have these for sale, but we do have a number of other Maximum Cards on recent and older stamp issues in our webshop.