due to this politic and the lack of investments in mitre line, the quality of the service decreased considerably. tba operated the line until the 2012 once station rail disaster happened. as a result, the national government revoked the concession granted to tba and gave the mitre and sarmiento to state operator ugofe, that managed the line until 2014 when it was given under concession to corredores ferroviarios s.a.