the line's history is closely tied to that of line 7, line 8 and line 13. a section of line 10's route was replaced by line 13; 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, which 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.