The opening of the final stretch of the M1 metro line in the early hours of Friday marks a new chapter in the long history of Sydney’s train network.

The opening of the final stretch of the M1 metro line in the early hours of Friday marks a new chapter in the long history of Sydney’s train network.

Delayed by more than two years, the final stretch of the $30 billion M1 metro rail line was almost derailed on several occasions.

Delayed by more than two years, the final stretch of the $30 billion M1 metro rail line was almost derailed on several occasions.

The opening on Friday of the final stretch of Sydney’s M1 metro line is prompting authorities to make extra contingency plans to handle crowds.

The opening on Friday of the final stretch of Sydney’s M1 metro line is prompting authorities to make extra contingency plans to handle crowds.

Modelling shows the stations along the south-west section of the M1 metro line that are expected to become busiest after it opens on Friday.