The train between Chamonix and Argentière will be working soon

January 31st 2013: two trains traveled between Chamonix and Argentière.
The first train to depart from Chamonix at 15:00h was a snow plough, followed by a test train.
Further tests are to be conducted over the next few days.
The objective is to have the Mont Blanc Express open between Chamonix and Argentière for the February school holiday period.

At this moment, nothing is certain.

Source Radio Mont Blanc