A postal service bus that’s one of the last of its kind.It took its first journey in 1962, had 37 seats and served as public transportation and a mobile mailbox in rural Austria. Today, one postbus made by the Viennese firm Gräfe & Stift is still on the road, taking tourists on scenic rides around Lake Millstatt in southern Austria. It's the last of its kind, with a huge 8.3-liter six-cylinder diesel rumbling away out in front of the driver. drive it! took the old bus for a nostalgic ride.