The Metro network has 302 stations on 13 lines plus one branch line, totalling 294 kilometers , of which approximately 96% of stations are underground.underground stations The only surface parts are between Empalme and west of Eugenia de Montijo ( ); between Lago and north of Casa de Campo ( ); and between south of Puerta de Arganda and Arganda del Rey ( ), for a total of 8 aboveground stations.