Line 6 of the Madrid Metro opened originally between Cuatro Caminos and Pacifico in 1979. This is one of two circular lines in Madrid, but unlike Line 12, it did not open as a full circle. The circle was completed in 1995, taking four stages from its original opening. It has a length of 23.5 km (14.6 mi) and is coloured grey on route maps.
Line 6 train in Guzmán el Bueno station
The Madrid Metro is a rapid transit system serving the city of Madrid, capital of Spain. The system is the 14th longest rapid transit system in the world, with a total length of 293 km (182 mi). Its growth between 1995 and 2007 put it among the fastest-growing networks in the world at the time. However, the European debt crisis greatly slowed expansion plans, with many projects being postponed and canceled. Unlike normal Spanish road and rail traffic, which drive on the right, Madrid Metro trains use left-hand running on all lines because traffic in Madrid drove on the left until 1924, five years after the system started operating.
The closed Chamberí station on line 1
Metro de Madrid Diesel motors used for generating electricity before the Spanish Civil War
Typical Madrid metro entrance, designed by Antonio Palacios, at Tribunal station
Lago station in the old Line S (now Line 10) is one of the few surface stations in the Metro network.