Melbourne's proposed airport rail line would be a "game-changer" for the city's west, sparking the creation of a jobs and tourism-led transformation of the suburb of Sunshine, according to the municipality's mayor.

As a route for the $10 billion line from the city through Sunshine and on to the airport firms up as the most likely option, the mayor of Brimbank said the project would open up Melbourne's west.

Cr Margaret Giudice has joined the state government and Melbourne Airport chiefs in arguing a high-speed train line from the CBD through Melbourne's western suburbs is the best way to deliver a "fast, frequent and affordable" airport rail link.

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The federal government, which committed up to $5 billion for the project, is yet to express a clear preference for any of the three main route options but is understood to be getting more interested in the benefits of sending the line out west.