The only new infrastructure required is the train station, the car park and the connecting walkways. Other possible costs would include the refurbishment of existing trains and possible changes to signalling from Homebush to Strathfield.
We estimate the costs as follows:
Train Station: $50 million
Multi-level car park (including access road): $60 million
Train refurbishment (eight trains): $16 million
Signalling upgrade: $4 million
Total cost: $130 million
(Source: published costs for multi-level buildings and estimated costs for train refurbishment and signalling upgrade)