The 20-Minute Platform ('Voie') Rule & Car Numbers
At French mainline stations, the departure track ('Voie' or 'Quai') is posted on the blue departure screens ('Départs') exactly 20 minutes before departure. Check your coach number ('Voiture') on the platform screen so you stand right where your car stops, scan your QR code at the automatic platform gate, and ensure every bag has a physical name tag.
Connecting Between Paris Train Stations
If transferring from Gare du Nord (Eurostar/Lille) to Gare de Lyon (TGV South to Lyon/Marseille/Nice), hop on RER Line D for 2 stops (8 minutes). Between Gare Montparnasse and Gare du Nord/Est, take Metro Line 4 direct. Always leave at least 60–75 minutes between separate TGV tickets across Paris.
Official sources & further reading
Rules, prices and schedules change. Confirm details here before you travel: