Train commuters from the AirportLink stations of Green Square and Mascot will have their fares reduced from Monday, Premier Kristina Keneally announced today.

The decision to subsidise a "station access fee" paid to the private owners of the line will save a commuter from Green Square to the city $17 a week. It will cost the government $4 million a year.

Ms Keneally said the government had decided against removing station access fees from the stations at the domestic and international airports.

To do so – and bring fares to the airports in line with the rest of the City Rail network – would cost about $40 million a year.

The Premier said the expensive fares from the airport line were a legacy of the previous Coalition government.