Commuters face the closure of Sydney's Bankstown Line for up to two months each year for five years from 2019 and more than the usual number of shut downs at weekends to allow for construction of a new multibillion-dollar metro train line.

Those closures are in addition to the shut down of the rail line for three to six months towards the end of the construction phase of the project in late 2023.

The extent of the disruptions to tens of thousands of commuters who travel on the 13.5-kilometre stretch of track is detailed in an infrastructure report on the Sydenham-to-Bankstown component of the $20 billion Sydney metro rail line.

The report said track possessions – when trains would not be running – would occur during each of the December-January school holidays between 2019 and 2024, as well as the two-week holidays in July of each year during the period.