The story
As part of railway privatisation carried out during the presidency of Carlos Menem, a concession to operate the services was granted to the government of Chaco Province in 1992, being later transferred to "Servicios Ferroviarios del Chaco" (also known for its acronym "SEFECHA") which started operations in 1997.
The Government of Chaco carried out a plan to rehabilitate some branches within the Province, the first being the Cacuí-La Sabana line, which was re-opened in December 1997 running railcars by German company MAN.
In March 1998, another service was added, the Sáenz Peña-Taco Pozo line, with 3 trains a week. The 319 km route covered the north of Santiago del Estero Province. That same year SEFECHA re-opened the 190 km long Sáenz Peña-Chorotis branch.
The Cacuí-Resistencia-Barranqueras line (which service was named Metropolitano) was re-established in August 1999, using re-modeled Ferrostaal railcars.
In May 2010, the Government of Argentina took over services previously operated by SEFECHA, which was dissolved. These services, together with those of Tren de las Sierras in Córdoba Province, are the only ex-General Manuel Belgrano Railway passenger services in the interior of the country that are still in operation.
From Wikipedia’s article on Servicios Ferroviarios del Chaco, shared under CC BY-SA 4.0.3