The Administración de Ferrocarriles del Estado is the autonomous agency in charge of rail transport and the maintenance of the railroad network. Uruguay has about  of operational railroad track. Until 1947, about 90% of the railroad system was British-owned. In 1949, the government nationalized the railways, along with the electric trams and the Montevideo Waterworks Company. However, in 1985 the "National Transport Plan" suggested passenger trains were too costly to repair and maintain. Cargo trains would continue for loads more than 120 tons, but bus transportation became the "economic" alternative for travellers. Passenger service was then discontinued in 1988. However, rail passenger commuter service into Montevideo was restarted in 1993, and now comprises three suburban lines.