Paris Métro Line 10

Paris Métro Line 10 is one of 16 metro lines in Paris, France. The line links the Boulogne – Pont de Saint Cloud metro station in Boulogne in the west with the Gare d'Austerlitz, travelling under the neighborhoods situated on the Rive Gauche in the southern half of Paris and the commune of Boulogne-Billancourt. Its two termini are Gare d'Austerlitz and Boulogne – Pont de Saint-Cloud.

The line is entirely underground and stretches 11.7 kilometres (7.3 mi) across 23 stations. It has the least traffic of any of the 14 main metro lines (excluding lines 3bis and 7bis).

Initially, the MA 51 model trains, which had previously been used on line 13 until it joined 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 where its terminus was replaced by Balard. There is a ghost station named Croix-Rouge between Sèvres Babylone and Mabillon. It was closed in 1939. Consequently, line 10 has changed the most of any other métro line during its lifetime. Unlike those of other lines, the walls of line 10's tunnels are painted white, creating a brightness that is not found on any other métro line.