The O’Farrell government intends to build the  with 15 kilometres of double small-diameter tunnels (around 6m). These will fit only single-deck metro-style rolling stock. Compared to the standard-sized tunnels of the Epping-Chatswood line, which have walkways 850mm wide, the NWRL’s planned narrow tunnel size allows only very narrow and height-constrained escape walkways. They will be Read more about rAlien – North West Rail Link[…]