Repairs on a section of Tunnel One that was damaged during cross passage construction in September 2018 are complete. A similar method to the one used in the London Underground, the installation of spheroid graphite iron lining has achieved the required strength, durability and water tightness required for the 120-year lifecycle of the tunnels.

Track laying is proceeding well with almost 17km of track laid in the tunnels and at each end of the line. More than 100 workers are involved in the rail infrastructure construction, which includes track laying and installation of overhead line equipment (OLE) by mechanics, fitters, riggers, rail traction linesmen, engineers, concrete and track workers.