The group’s rail profits increased from £20.3 million to £32.9 million in the first half of the year.
Go-Ahead, which already carries a third of UK rail passengers on its routes, is also bidding to take over the running of London Overground services.
The company’s contribution to the Department for Transport increased by £18.4 million to £126.6 million. It has also renegotiated its GTR franchise with the DFT, as a new timetable — different to the one that Go-Ahead based its bid for the franchise on — has substantially increased costs.
Buses in the capital were the only bleak spot for the transport operator as roadworks and congestion affected its performance. Operating profits for London buses fell by 4.4% to £21.7 million.