This website allows you to do a map search to see which trains are running on SNCF at any given moment. Once the train is clicked the route is shown on the map. All very interesting, but tonight intercities de nuit 5792 Briancon dep 2003 to Paris Austerlitz is routed on the map to run on the LGV all the way from near Crest to Paris, i.e. via Lyon St Expury etc. Is this right? I thought the LGV is shut at night but why would the app show this route?