Trains will run every six and a half minutes in Melbourne’s north-east, with the Andrews government promising to duplicate single sections of track running through marginal seats if it wins the November election.

For $530 million, Labor has promised to rebuild Greensborough station and add three kilometres of extra track between Greensborough and Montmorency.

It will be built in 2020 and finished by 2022, benefiting commuters in the marginal, Labor-held seats of Eltham and Yan Yean.

Premier Daniel Andrews, who oversaw the first stage of Hurstbridge line upgrades that duplicated track between Heidelberg and Rosanna, said only Labor could be trusted to carry out the next phase.