The six companies were managed by Ferrocarriles Argentinos which was later broken up during the process of railway privatisation beginning in 1991 during Carlos Menem's presidency.

[1] In 1873 the British-owned East Argentine Railway opened a line between Concordia and Mercedes, extending these services northwards outside Entre Ríos to Corrientes for the first time.

In November 1886, Congress approved the line's expansion to Misiones province, taking it from Monte Caseros in Corrientes to Posadas.

In 1898 the company's owner John E. Clark transferred his concession to the Argentine North Eastern Railway, which opened the Monte Caseros - Posadas line in 1890.

It is still possible that the existing ramp would allow connection to line B, enabling trains to run through to the centre of Buenos Aires, though this has still yet to be done to this date.

It was opened in 2014 and is operated by Casimiro Zbikoski S.A. under the authority of the state-owned Trenes Argentinos using Dutch Wadloper rolling stock.

[18] It currently carries 8,000 passengers daily and expansions are being considered as the service is already reaching its maximum capacity.