de Buenos Aires Sociedad del Estado (SBASE) under Buenos Aires mayor Osvaldo Cacciatore of the National Reorganisation Process military junta. After a long period of stagnation, the Underground began to be expanded again with Lines B and E within the scope of these plans, though only the extension of Line E was commenced and completed before the transition to democracy where expansion was once again stalled. During this time, four Premetro feeder lines were planned leading out from the western termini of Lines D and E as well as one in Puerto Madero, however only Line E2 was completed in 1987 and these plans were scrapped in 1994 when operation of the Underground changed hands. Privatisation In 1994 the operation of the network was privatised, along with the country's railways, and is now managed by Metrovías. SBASE (as part of the Government of the City of Buenos Aires) maintained ownership of the network, its rolling stock, and infrastructure, and administers its expansion and budget. One cosmetic change carried out in the 1990s under private operation was the re-assignation of the colours of the lines, with Lines B and D switching colours, Line C changing from purple to blue and Line E changing from yellow to purple. The change of colours was also accompanied by a standardisation of the network's signage to match the new schemes. In 2012, the role of Metrovías was lessened to simply operating the lines, while maintenance of infrastructure became the responsibility of SBASE. The relationship between Mauricio Macri's mayoral administration and Metrovías became increasingly strained, with the Government of Buenos Aires issuing multiple fines to the operator. The relationship was further strained in 2013 when Metrovías' 20-year concession ended and has since been renewed on a year-by-year basis, leaving the door open for a state-run or mixed operation. Among the public, privatisation has proved unpopular, with a survey carried out in 2015 indicating that 82% of passengers would like the Underground to be operated by the state instead of a private company. In more recent years, Line A and Line B have been extended westwards, adding a total of 4 stations to each line between 2003 and 2013. During the same period, Line H was opened 2007, making it the first completely new line on the underground since Line E, excluding the Premetro. There have also been significant modernisations of infrastructure, signalling systems, stations and the