Lacroze terminus in the barrio of Chacarita, to General Lemos terminus, Campo de Mayo in Greater Buenos Aires. The line is completely at grade (ground-level) and uses third rail current collection. It operates 20 hours a day, 7 days a week at 8-to-30-minute intervals. The Urquiza Line transported 15 million passengers in 2013. Originally the line was planned to run into the centre of Buenos Aires through a long tunnel. But when the tunnel was finally built in 1930, it ended up as Line B. The access ramp still exists and is in use today, but for maintenance and storage purposes rather than for passenger services. The Urquiza Line itself opened in 1948, so suburban passengers travelling on the Underground's Line B have to transfer to the Urquiza Line at Federico Lacroze station, named after its builder, about from the city centre. Stations and connections Stations are listed from East to West or North to South. Stations in gray have yet to open. Stations in bold are the current termini. Small interchange icons indicate interchanges under construction Ghost stations There are four ghost stations on the Buenos Aires Underground, two on Line A and two on Line E. The Line A stations – Pasco Sur and Alberti Norte – were closed in 1953 since stations in that part of the line were grouped very closely together and having fewer stops improved the line's frequency. Pasco Sur remains in very good condition, while Alberti Norte was converted into an electrical substation. The Line E stations were closed in 1966, after the line was re-routed from Constitución railway station (where it connected with Line C) closer to the centre of the city, leaving the San José vieja and Constitución stations out of the network, a move which tripled traffic on the line. The two stations have subsequently been used as workshops and storage areas. At one point it was considered that the two former Line E stations and tunnels should be used for Line F since the line's southern terminus would be there and that part of the route would be roughly similar to the old Line E. However, it was eventually decided that the line should use new tunnels in that section due to its sharp curves. Expansion plans There have been several plans to expand the Underground system as a whole. The Underground's routes are said to spread out like