Following a commuter train accident on February 22, 2012, at Once Station, Buenos Aires, in which 51 people died and at least 703 people were injured, TBA was placed under federal intervention on February 28; its concessions to operate the Mitre and Sarmiento lines were ultimately revoked on May 24. After the cancellation of the contact, both lines were taken over by the consortium Unidad de Gestión Operativa Mitre Sarmiento (UGOMS) and later Trenes Argentinos, putting them back in state hands.