The PwPost Bay 06 was a combined mail and luggage van designed for Lokalbahn branch line train services with the Royal Bavarian State Railways in the early 20th century.

As Bavaria's network of Lokalbahn railways grew so did the requirement for suitable coaches for local passenger transport.

Between 1905 and 1911 a total of 281[1][2] wagons of classes BL, BCL, CL and PPostL were procured, all of which - except for the wagons of Class PPostL - had a uniform floor plan, open platforms at each end with Dixi gates on the steps and gangways only protected by a single iron railing.

Because the construction of individual mail or luggage vans on the lightly used Lokalbahn routes was too expensive and unnecessary, between 1905 and 1911 87 combined mail/luggage vans were procured, of which 79 were of the type PwPost Bay 06 built to Design Sheet 606.

The vans were fitted with VDEV screw couplings, the drawbar was continuous and sprung in the centre.

The vans had axle boxes of a short, straight design made of rivetted sheet and angled steel.

The frame of the van body consisted of wooden posts and beams reinforced by steel straps.

The gently curved barrel roof was more rounded at the edges, transitioning smoothly into the side walls but extending like a hood over the gangway.