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The Premetro is a 7.4-kilometer long (4.6 mi) light rail line that runs along the outskirts of Buenos Aires, connecting with the Buenos Aires Underground line E, at Plaza de los Virreyes station and then to General Savio, with a short branch to Centro Cívico. It opened in 1987 and is operated by Metrovías. Originally, the Premetro was to include many more lines, but shortly after the privatisation of the railways the projects were postponed and never materialised and only "Premetro E2" was built. From Wikipedia