The French national railways has announced that rail traffic between Modane and St-Michel-Valloire will be disrupted for the time being due to a landslide that was reported in the French Alps on 27th August. This would impact train journeys on the route between Paris – Turin – Milan for the next several months. Read more about it on the SNCF website.
From 10th January, TGV trains will operate between Paris to Milan with a replacement bus from St Jean de Maurienne to Oulx after which passengers can continue their journey to Milan by train. The travel schedule including the replacement bus service with a slightly longer travel time will be updated on the Eurail Timetable and can also be found on the SNCF timetable. Your reservations will be valid for the whole route, including the replacement bus service. For more information, see this SNCF document.
If you're planning to travel on the impacted route before 10th January, we recommend using an alternative route via Zurich. Please note that the route from Paris – Zurich – Milan is currently facing a delay due to the closure of the Gotthard Tunnel in Switzerland (check post below for more information). Please make sure to check the SBB timetable shortly before departure of your planned journeys for up-to-date information.