The metre gauge line Saint-Gervais-les-Bains - Chamonix - Vallorcine has a third rail with electric power for the railway.
The "Mont Blanc Express" Chamonix - St Gervais is crossing the "Sainte Marie" viaduct.
The "Mont Blanc Express" St Gervais - Chamonix is crossing the "Sainte Marie" viaduct.