This seems a fabulous proposal which I hope gets taken up in some way.
Parramatta Rd is a shame of Sydney.

> it's unlikely to be able to proceed north of Central as all the CBD

north-south routes are now fully accounted for.

There is plenty of space in the George St traffic-light cycles to add
another route. There are substantial gaps between trams, and adding
another route would be of substantial benefit to passengers.

Pre-1958, George St had many more tram movements than now, and a lot more
motor traffic too.