The Rhätishe Bahn (or Rhaetian Railway) is a publically-owned Swiss railway, serving the huge and mountainous canton of Graübunden. The Swiss Federal Railways extend only a few kilometres over the cantonal border to the capital at Chur, as seen at the top of this interesting little map. Placed underneath the window on trains, between facing rows of seats, this map features something I’ve never seen on a diagrammatic map before: elevation contours.

Four colours — green, brown, blue and white — signify four bands of elevation, all the way up to 4,000 metres (13,000 feet) above sea level! Because of this, it’s quite easy (and very interesting!) to see how the railway mainly runs along valleys at lower elevations, and where tunnels are needed to cross from one valley to the next.

Source: lloydshep/Flickr – user no longer active