I am advised:
Option 2 will provide a direct link to the city for about 90 per cent of morning peak customers, while minimising impact on the remainder of the network. Community feedback and Opal data confirms this option is the most effective solution.
Birrong and Yagoona customers will still have access to frequent trains, to connect with Metro services at Bankstown, to access both the city and north western Sydney. These customers could also travel to either Lidcombe or Regents Park to access other destinations.