This FDC was from Historic Service Vehicles issued in Oct,1997 showing Postal Bus in Prague.
A postbus is a public bus service that is operated as part of local mail delivery. As a means to provide public transport in rural areas with lower levels of patronage where a normal bus service is uneconomic Postbus services are run by the postal delivery company and combine the functions of public transport and mail delivery/collection.
The first post bus lines in Bohemia started in the days of Austria-Hungary, in 1908. The first lines were Pardubice – Bohdaneč (11 km, 64 minuts) and Pardubice – Holice,other lines came later. In 1914, bus transport in Bohemia, Moravia and Slovakia consisted of 23 lines in all, at which operated 33 postbuses and 13 private buses. During the World War I, bus transport was interrupted, vehicles were requisitioned by the army and rebuild to trucks.