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Fiat-Materfer (Buenos Aires Underground)
The Fiat-Materfer Buenos Aires Underground rolling stock was built by the Argentine company Materfer - then a subsidiary of Fiat Ferroviaria - beginning in 1980 and continuing on through that decade. It was originally conceived to standardise the diverse rolling stock of the Buenos Aires Underground with the use of one model throughout all the lines. However, with the economic and political turmoil faced in the country during and following the collapse of the National Reorganisation Process junta in 1983, its production ended up being far more limited.〔〔 Today the cars serve as temporary stock for two lines, being phased out as newer models arrive from overseas.
==History and overview==
By the late 1970s, the Buenos Aires Underground had a vast array of ageing rolling stock - given that the different lines were developed by different companies in different periods - and the need for standardisation was becoming apparent given the increased cost of dealing with so many different models. One challenge was the use of 1100v electrification on Line A (though it was converted to 1500v in 2013〔(La línea A de subte estará cerrada desde el 12 de enero al 8 de marzo ) - La Nacion, 4 January 2013.〕) and 1500v on other lines, but also the use of third rail on Line B while all others use overhead lines.〔(Ferrofilatelia ) - EnElSubte, 6 June 2010.〕〔(Denuncia contra la compra de nuevos coches para los subtes ) - Perfil, 20 July 2014.〕
In 1978, Materfer presented a prototype vehicle which solved the issue of the different voltages by providing a model which could be easily switched between the two voltages, though Line B would remain an independent entity in the underground network. The trains were produced throughout the 1980s for use on Line E, however due to the economic problems in the country at the time, they never attained widespread use on the rest of the network since there was not the funding available to purchase new rolling stock for all the lines.〔(Línea E: 70 años buscando pasajeros ) - EnElSubte, 20 June 2014.〕〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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