The project team charged with converting Sydney's Bankstown Line to take driverless metro trains is considering pre-fabricating standardised stations at factories before shifting them to their final locations to "bolt together".

The conversion of the 110-year-old Bankstown Line presents one of the larger challenges for the project builders because of the need to close it for more than six months, forcing tens of thousands of commuters onto buses.

The 13.5-kilometre line from Bankstown to Sydenham also services freight trains, while heritage buildings are located alongside it.

Tim Parker, the project director for the second stage of Sydney's $20 billion-plus metro line, told a transport conference on Friday it was looking at standardising the 11 stations.