Line E of the Buenos Aires Underground runs from Retiro to Plaza de los Virreyes, a total distance of 12 km. Opened in 1944, the Line E was the last completely new line to be added to the Buenos Aires Underground, until 2007 when Line H was opened. The line has a history of being re-routed and extended due to having been historically the line with the lowest passenger numbers on the network. History Line E was opened on 20 June 1944, after construction began in 1938, with an original route that ran from Constitución railway station to General Urquiza. Soon after, it was decided to abandon the terminus at Constitución (which also served as the connection with Line C) and instead reroute the line towards the Plaza de Mayo. Work began in 1957, and in 1966 the San José, Independencia, Belgrano and Plaza de Mayo (now Bolívar) stations were opened to the public by president Arturo Umberto Illia. For many years, the two stations that had been closed as a result of the Line E re-route remained unused until the mid 1990s when one was converted into a workshop to service the rolling stock of the line. The line was further extended in 1973 to José María Moreno and then again in 1985 to Plaza de los Virreyes. The PreMetro E2 tramway was completed in 1987 and was linked to Line E with the intention of connecting a larger Premetro network to the line, although this never materialised following privatisation. Under the private operation of the Subte by Metrovías, the colour of the line was changed from yellow to purple during the 1990s. Purple had previously been used for Line C, while yellow is now used for Line H. Extension to Retiro As part of a general effort to extend the Buenos Aires Underground, it was decided to extend Line E from Bolívar to Retiro railway station (with intermediate stations at Catalinas and Correo Central) where it would re-connect with Line C and the Mitre Line, and eventually Line H when its extension was completed. By 2014, all the major structural works had been completed on the three new stations with the tracks and signalling systems still to be completed. In July 2015, the City of Buenos Aires confirmed that, despite the advanced state of the works, the extension would not be opened until 2019 citing delays that came