The Mont Blanc Express railway service from Chamonix to Châtelard-Frontière (Swiss border) is closed during the spring 2017 to allow the installation of a new rail operation system (MZ).
Aware of the inconvenience, the SNCF will set up a shuttle service for this train route.
From 3rd April to 24 June 2017, all the Mont Blanc Express trains will be replaced by shuttles between Saint-Gervais and Le Chatelard Frontiere.
So, the shuttle will follow the train timetables from Châtelard-Frontière to Chamonix, passing through Chamonix, Argentière and Châtelard.
Also, Montroc will not be omitted, as a special small navette with a specific timetable will assure the run from Montroc to Argentière.
You can book your ticket via the SNCF website or directly from the train stations.
Check out the full timetables for the shuttles and the navette on Chamonix.net