Paris Métro Line 10

Paris Métro Line 10 is one of the sixteen currently open métro lines in Paris, France. The line links Boulogne–Pont de Saint-Cloud, in Boulogne-Billancourt, to the Gare d'Austerlitz, traveling under the rather bourgeois neighborhoods of the Rive Gauche — the southern half of Paris — the 16th arrondissement and the neighbouring commune of Boulogne-Billancourt.

The line runs entirely underground and stretches 11.7 kilometres (7.3 mi) across 23 stations. It has the least traffic of the fourteen main metro lines, excluding lines 3bis and 7bis.

Initially, the MA 51 model trains, which had previously been used on Line 13 until it absorbed former Line 14, circulated on the tracks of Line 10. These trains were first constructed with three cars on four bogies per train, and two trains permanently connected to make six cars per train, having an equivalent capacity to five cars on the classic metro trains. Because of the ineffectiveness of the MA 51 model, it was eventually completely replaced by the MF 67 model between 1988 and 1994.

The line's history is closely tied to that of lines 7, 8, and 13. A section of Line 10's route was replaced by Line 13, and Line 10 replaced part of Line 7 for more than a year, until eventually replacing the western section of Line 8 in 1937 when said line swapped termini from Porte d'Auteuil to Balard. Consequently, Line 10 has changed the most of any other Paris métro line during its lifetime. Unlike other lines, the walls of Line 10's tunnels are painted white, creating a brightness that is unique to the ochre line.