page_title: Buenos Aires Underground rolling stock
section_title: Line B
hierarchical_section_title: Buenos Aires Underground rolling stock / Lines / Line B
caption_attribution_description: English: Original file by Mauricio V. Genta cropped to concentrate on the Eidan 500 rolling stock.
context_page_description: The Buenos Aires Underground has one of the most diverse metro fleets in the world, and has had some of the oldest models in operation on any network. The network began with a relatively standardised fleet, but throughout its over 100-year-long history, it has seen numerous purchases which have created cases where some lines operate numerous models. Recently there have been increased efforts to modernise and standardise the fleets, with large purchases from China CNR Corporation and Alstom.
context_section_description: Line B has been historically the most diverse of the network given its significantly different characteristics to other lines and thus its rolling stock has not been uniform for most of its history. This was addressed in 1996 when rolling was purchased from the Tokyo Metro Marunouchi Line in order to make the line uniform. This was also the first time in the network's history that rolling stock was purchased second hand. In 2003, two stations were added to the line, followed by another two in 2013, meaning that the already old rolling stock was now also stretched to capacity. In 2011, it was announced that the Madrid Metro had sold some of its 5000 series trains to the Underground, which had been in operation in Madrid since 1974, and entered service in 2013 in order to make up shortfalls caused by the line's extensions. The 36 Spanish cars were of lower quality and reliability than the Japanese trains, despite being newer, and suffered a series of mechanical issues following their integration into the line.
  In July 2013, Madrid Metro sold 73 of its 6000 series cars (which entered service in Madrid in 1998) to Buenos Aires for $38.8 million in order to retire the rest of the Japanese-built trains. A further 13 of these cars were purchased for $7.8 million, bringing the total up to 86. The purchase of the CAF 6000 rolling stock has been met with criticism due to major alterations that were made to the line to accommodate the cars' height, as well as the fact that the second-hand units were not significantly cheaper than simply purchasing new rolling stock, and are not of particularly good quality, unlike the new Line A cars. The biggest drawback of these cars is that, unlike the Eidan 500 and CAF 5000 cars, they use overhead electrification instead of third rail, and were thus unsuitable for the line, which had to be adapted to use both third rail and overhead electrification for what was by this point three models of rolling stock circulating on the line. Similarly, changing to overhead lines would mean that the potential for an overground branch of the line from Federico Lacroze using Urquiza Line tracks would be lost since that line also uses third rail electrification. Following a series of setbacks caused by the power inefficiency of these trains, as of August 2015 it was unclear if they would be used on the line or moved elsewhere and new plans drawn up for the line which would not involve Spanish rolling stock.
caption: The Eidan 500 trains could continue above ground on the Urquiza Line.
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