beginning at "odéon" the route of line 10 becomes complixed as it must pass an intersection with line 4. the two tracks part in order to yield passage to the connection tracks that arrive in the middle of the circulation tracks and level off at the station "cluny – la sorbonne". the connection tracks rejoin the other tracks of line 10 before the station "maubert – mutualité". the same principle is in effect with the connection to line 7 but these double tracks pass under the tracks of line 10 before the station "cardinal lemoine". when the route reaches the station "jussieu", lines 7 and 10 follow parallel routes which allows for the platforms of the two lines to be side-by-side. finally, the line follows bends in both direction under the "jardin des plantes" to arrive at the terminus, "gare d'austerlitz". the arrival is situated under the arrivals hall of the train station, and the turn-around loop is under the railroad tracks. this cul-de-sac is peculiar in the sense that it is configured to receive an underwater passing coming from the "gare de paris-lyon".