Line 5 is a rapid transit line in the Madrid Metro system since 5 June 1968. It is the fourth most used line of the Madrid system, transporting 64 million passengers a year. It is 27 kilometers long. Line 5 also contains the only elevated ground platform in the Madrid Metro, at Aluche station. Aluche is also the only station where the metro is above the Cercanías commuter train, which generally runs above ground. From Wikipedia
