National Express has been awarded an extension on its c2c franchise, which runs between London and Essex, by the Department for Transport.
The contract had been due to expire in 2011, the firm said, but will now run for a further two years until May 2013.
Former transport secretary Lord Adonis said last year it was "unacceptable" for National Express to continue running franchises.
This was after the firm gave up the East Coast Main Line in November 2009.
However, since then, the firm has been given a reprieve on its only other other franchise - East Anglia.
In September, the coalition government gave it a 28-week extension beyond the original expiry date of 31 March 2011.
The previous Labour government had said it would not be extended.