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It was three months out from the 2018 state election when Victoria's premier, Daniel Andrews, took to Facebook with a slick promotional video accompanied by a soundtrack worthy of a Christopher Nolan film.

The biggest public transport project in history is coming to Victoria," a voiceover said, describing a proposed 90km underground railway running between Cheltenham in the south-east and Werribee in the south-west via a long-awaited station at Melbourne airport.