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Handedness of rail traffic: left hand and right hand operation world wide.
(upload.wikimedia.org)
Not visible in the map, but interesting to note, is that in France the trains normally drive on the left, except in Alsace where they drive on the right as a legacy of the time the province belonged to Germany.
I thought all trains were only from and to Paris, so you’d have to change trains at most once, whether you’re going from Marseille to Toulon or from Caen to Le Havre.
Paris has more than one terminus.
That sounds highly inefficient.