Re: Re 4/4 diagram query
Thello operates the nightly EN 220/221 Venice-Paris and three daily Milano-Nice, while SNCF operates three daily TGVs Paris-Milano with connection to Rome.
Usually, the Venice-Paris Thello operates via Modane on the nights Mo/Tu-Fr/Sa and via Vallorbe/Frasne on Sa/Su and Su/Mo, but there are sometimes exceptions to that rule. The Thello page does not give details on the particular route, the SNCF page does (for ex. https://www.sncf.com/fr/itineraire-reservation/recherche-numero-train/details-train/220?date=22%2F06%2F2019&codeCirculation=OCEBD000220F01001&codeZoneArret=OCE83025932).
Yesterday, the Mont-Cenis line was interrupted by a mudflow as a result of violent storms between St-Michel-de-Maurienne and Modane and will remain closed for several weeks. Yesterday night's EN 221 ended its run at Dijon. Thello has announced that it is looking for alternatives, which could include operating nightly via Vallorbe, while SNCF is looking at operating its TGVs either via Vallorbe or Ventimiglia.