Emprendimientos Ferroviarios S.A. (Emfer) was an Argentine rail rolling stock manufacturer based in San Martín, Buenos Aires.

The Emfer rail rolling stock ran on the two lines until 2014 when they were replaced with CSR Corporation Limited Electric Multiple Units.

[2][3][4] The company's main factory in San Martín once belonged to the state-owned Fabricaciones Militares (which manufactured military products in addition to rail rolling stock).

In January 2014 they decided to sell EMFER after the government of Argentina removed their concession to run the Sarmiento Line.

Later in 2014 the company became a subsidiary of CSR Corporation Limited,[6] with the takeover intended so that the Chinese firm could build rail rolling stock in Argentina.