Sydney Metro West part 4: separate Parramatta CBD station confirmed

My previous posts on Sydney Metro West (November 2016) highlighted how Parramatta station in the coming decades will be as busy as Wynyard is today.  The conclusion drawn from my post in November 2016 was that the current Parramatta station will be primarily a destination station (like Wynard/Town Hall today, with 4-6 platforms), and could not serve an interchange function (like Central is today, with approximately 20 platforms).  This seems pretty basic and self obvious, as Parramatta station is only 4 platforms with limited stairs/lift capacity, and it would be expensive and disruptive to upgrade it into 20 odd platforms like Central today.

Six months after my post, Parramatta city council has released a transport study.  The link to this study is at:

https://www.cityofparramatta.nsw.gov.au/sites/council/files/inline-files/Att_01%20Parramatta%20CBD%20Strategic%20Transport%20Study.PDF

This study was commissioned by the local government council but used the TfNSW Strategic Transport Model (STM).  It is full of reams of new data but of particular relevance is Action 10.2 on page 33, which states the following:

Action 10.2: Consider the need for, and plan for a second railway station in the CBD in order to offer additional travel options from broader areas to the CBD and address future level of demand. Current forecasts indicate similar station demand to Wynyard by 2036; there is a need to decentralise demand and de- congest the Parramatta Transport Interchange 

The above action point confirms my previous assertions that "old" Parramatta station is unsuitable to be an interchange point with Sydney Metro West (due to it's inability to handle the massive passenger flows required of an interchange station).  Instead, the future Sydney Metro West Parramatta CBD station will be physically separated from the "old" Parramatta station.  The configuration will be similar to North Sydney/Victoria Cross and Pitt St/Town Hall - in each case, TfNSW elected to create a new station that does not interchange with the old station, and instead operates in a new/complementary CBD catchment as shown in the diagrams below:

Note how Victoria Cross, by being located separate to North Sydney extends the rail catchment of North Sydney CBD, as well as providing capacity augmentation to the busiest part of North Sydney (where the two station catchments overlap).