Bussoleno–Susa branch The Turin–Modane railway is the international rail connection from Turin, Italy to Modane, France.

On 12 December 1917, a troop train containing 800-1000 French soldiers returning home on leave from fighting in North East Italy, having passed along this line and through the Fréjus Rail Tunnel into France, derailed at speed near Saint-Michel-de-Maurienne, killing several hundred soldiers.

The uphill line was designed with S-shaped tunnels in order to reduce the gradient, increasing its length.

On the western edge of Bardonecchia is the mouth of the tunnel, with a monumental gateway, enclosed by two round towers, all topped by battlements.

In the nearby village of Rochemolles there are signs of the first entrance to the tunnel; it is now bricked up but it has some holes where the tracks inside can be seen.

Since 2002, regional train services have ended at Bardonecchia; previously they crossed the border through the tunnel to Modane.

Four pairs of daily trips each day connect Turin Orbassano goods yard and the French terminal at Aiton at the bottom of the Maurienne Valley.

The line is intended to be superseded for long-distance travel by the Turin–Lyon high-speed railway through the Mont d'Ambin base tunnel, currently under construction.