PostBus, Switzerland

A yellow PostBus waits for a Rhaetian Railway train at Küblis station in the Prättigau valley, Graubünden, in October 2021. Swiss Post started its first scheduled motor mail route, Bern to Detligen, in 1906, and the yellow buses now meet trains in valleys and climb the Alpine pass roads. Listen for the three-note horn, C sharp, E and A, taken from the overture to Rossini's William Tell; few bus sounds anywhere are so instantly recognized.