This was a really cool way of getting from Chamonix in France to Martigny in Switzerland. Instead of going to Geneva, I hopped on the bus from Chamonix Mont Blanc station (at present there is a bus that takes you from Chamonix to Vallorcine to reconnect with the train). It is incredibly cheap for the wonderful little trip it provides. It was under £15 to get all the way to Martigny in Switzerland if you pay full price. I had an interrail pass for Switzerland so the trip from Chamonix to Martigny cost all of 10.30 euros for me (one-way). A bargain. It was a stunning ride on a single track. Amazing engineering and you are so close to the rock faces etc some of the time. Absolutely brilliant. If you just wanted a day trip you could go there and back and have lunch in Martigny and return either to Chamonix or to St Gervais Fayet which also has some interesting things to do (hot mineral baths). In Martigny there is a very good creperie just a short walk down the road opposite the station.
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