It was 24 kilometers long and roughly followed the route now occupied by the line 2 and line 6 of the metro.
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The northern circulator, now Line 2, opened in 1903, while the tracks from Étoile to Trocadéro (referred to as Line 2 Sud) opened on 2 October 1900 as part of a branch of Line 1 meant to serve the World Expo of that year.