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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.
Train noob here, what does the "20% of multi-track operation" line mean?
An affordance to allow this maneuver: