Eastern Switzerland has become the PostBus hub for double-decker buses with the addition of 19 new vehicles from Alexander Dennis Ltd.

Double-decker Postbuses have been part of the fleet in Eastern Switzerland since 1995. The third generation is now being produced, as the double-decker buses used up until now are becoming outdated. The first two of the new vehicles will come into service soon. They will mainly be used on the Engelburg–St. Gallen–Heiden routes and then subsequently in the Obertoggenburg and the regions of Rorschach and Goldach. Double-decker buses are well suited for winding roads that are frequently used. Passengers are more comfortable on these routes in double-decker buses than articulated Postbuses as there are many more seats: they offer 78 seats and 55 standing spaces, whereas articulated Postbuses have more standing spaces than seats.

The vehicles ordered for Eastern Switzerland are based on Alexander Dennis' Enviro500 standard model, but the company has adapted them to PostBus’s needs and Swiss regulations.

Between now and the end of 2018, the 19 double-decker Postbuses used in Eastern Switzerland up until now will be replaced gradually by the new vehicles. The new double-decker buses are also equipped with two sets of stairs to the top deck, and they have three doors instead of only two. Both decks have dual display screens and free Wi-Fi. The vehicles are approximately 42-feet long and meet the strict Euro 6 emission standard.

Besides Eastern Switzerland, PostBus uses double-decker buses for regular services and leisure traffic only in Graubünden and in Central Switzerland. Although there will no longer be such a vehicle in Central Switzerland by the end of the year, the four in service in Graubünden will be replaced in the next two years by new double-decker buses.