No question that it is an expensive option but then so is tunneling from North Sydney under the Spit Bridge... the advantage of the Bondi Junction extension would be that it would provide an alternative to North Sydney and then through Wynyard. Those who wish to travel to Chatswood would do so as they do now- bus or car.
A few expensive option to go via a corridor that is already over 60% uterlised and hence limits the numbers from the north side, also ignoring the fact that many on Nth Beaches actually want to go to Nth Sydney/Chatswood corridor for Work
Correct me if I'm wrong, but Dover Heights to Manly (not via Wynyard and North Sydney) has a small obstacle called Sydney Heads in the way.It would all be in tunnel...
Are you building a bridge or digging a tunnel?
60% utilised is not a major issue- services to Dee Why would be extensions of existing Bondi Junct-Cronulla/Illawarra services.
As I said... my 2 cents worth... but tunneling is now a cost effective approach.
Just putting the following on the table fYI
- Its 1-2 km longer from Manly to Bondi Junction than to Wynyard via North Sydney and Mosman, ie going via Bondi would add 15min or so
- The line via Mosman would run via the population base of Mosman area and Nth Sydney CBD, going between the heads is expensive with no population in between.
- The line via Bondi already has a costly Achilles heel in that corridor to the city is already at 60% capacity thus severely limiting growth and future capacity, thus you are paying alot of money to cross the harbor that can never be fully uterlised. Also noting that simply extending the line through to Bondi Beach and beyond may see ridership rise by X amount which effectively limits traffic from Manly even further.
- The Mosman corridor is a natural flow, ie people already go that way. Few in Manly would be doing business in Bondi area or VV. ie Nth Syd to Chatswood and the ECRL is a work destination, Bondi is not.
My 2.2c worth is to tunnel from North Beaches, say starting at Dee Why, Curl Curl, Freshwater, Fairlight, Balgowlah, The Spit, Mosman, Neutral Bay, Nth Sydney, then cross the harbour, Underground Circular Quay, St James station (existing unused platforms), Pitt Street (extra two platforms), Central (extra two platforms), then become the Western Metro. A total distance of about 15-16km, built in phases over 10 years.
If the grade to St James is too steep (likely), then come up just west of the Sydney Harbour Tounnel and have the Quay station at eastern end of Circular Quay and if required build a set of new platforms between existing station at St James/Martin Place.