Appreciate the compliment but I would use anything I say/recommend as purely suggestion or playing devils advocate.
I respect your knowledge so I will leave it at that thanks Shane
RTT-RulesAvoid Town Hall, the station has enough problems managing future organic growth than it does a step change.
I think you are right but would that be in place of Town hall or as well as?
Suggest making use of Martin Place and new station at Pitt Street like the plan.
If you have other ideas, continue to develop and refine.
So you think there won't be any issues with the bends between Barangaroo and Martin Place? I agree with avoiding Town Hall - that was clearly an obvious decision for the new line to bypass that station - and Wynyard.
The only thing I think should be planned (and hopefully the powers that be are thinking about this) is what to do with Western suburbs capacity.
Presuming this line runs to the Bankstown line that alleviates the CityCircle but it doesn't really do much to help the Western Line which already is at or over capacity. I recently caught a train from Central to Harris Park at about 7pm and it was still packed like a sardine tin (7pm! - that's 2 hours after people start clocking off from work!)
Having a station at Sydney University could help slightly as that will alleviate Redfern a bit. But they really need another Western line; if not now than certainly in the future and as these things take years to build now is really the time to be thinking about this.
This might be a metro running underneath Broadway to Parramatta or it could run through Pyrmont and White Bay, and then down to Parramatta Road. The metro stations would have to intercept the existing CBD stations at some point so now might be a good time for the government to reserve space adjacent to the planned CBD stations so they can integrate easily.
Exiting the East side of the city a metro could swing south and stop at Surry Hills/Darlinghurst, then Waterloo and continue down Anzac Parade to Maroubra/Malabar. That could open up more of the Eastern suburbs to more med/high density housing.