The steep slopes on either side of Switzerland's Rhone valley are a paradise for visitors in both winter and summer, and the area is fortunate in having a variety of small colourful trains which enable us to make voyages of discovery around the region. The first of our two part look at the Transports Publics du Chablais concentrates on the BVB line which runs from the important village of Bex to the year-round resort of Villars, and then up to the Col de Bretaye.