Tunnel boring machine (TBM) Ruby has begun the last stage of tunnelling for the Sydney Metro West line, a project that will increase rail capacity between Parramatta and central Sydney.
At the start of September, the 1,100-tonne machine set off on its 1.1-kilometre drive from Pyrmont to the planned Hunter Street Station.
Ruby is progressing through Sydney sandstone at an average rate of around 90 metres each week, building twin tunnels about 37 metres underground. The breakthrough is…
