File:Sydney Metro A day in the life of a tunnelling segment

Description
We need 99,746 segments of concrete for Sydney’s new metro railway tunnels.

This is the story of how they’re made – from the specialised factory to their installation deep underground in the twin 15.5km tunnels from Chatswood to Sydenham.

More than 130 people work at the Marrickville factory run by Sydney Metro’s tunnel builders John Holland CPB Ghella, producing one four-tonne segment every six minutes.

Sydney Metro is Australia's biggest public transport project.