Has anyone seen any details on what alignments are being changed as part of this project?
The project website has no information about the actual railway changes though thats not surprising.
Six months ago, there was a table on the Concourse with a large plan of the railway tracks between Hornsby Platforms and Bridge St showing the proposed altered tracks.
Existing crossovers with their diamond slips connecting Platforms 1 & 2 to the Down and Up Mains would be replaced by ladder crossovers further north. The Down ladder would be 100m northwards, while the Up ladder, replacing the Up Refuge Loop and No. 1 Up Siding would stretch say 500m northwards.
Between the Up and Down Ladders there would be a turnback siding and footpath, located between the Up and Down Shores like Gordon, Lindfield, Kingsgrove, North Sydney, etc.
The single ladder with some diamond slips from P3 and P4 to the Inwards and Outwards Carsheds road would also be replaced by another ladder crossover.
By relocating the Down Shore to Down Main ladder say 100m from the platform, instead of 1m, the speed restrictive (8km/h) can be removed, allowing most if not all Down Trains to arrive at the speed of the 200m radius curve, namely 40km/h.
The new Shore turnback, allows most trains to arrive in P2 and return to the city in P1, providing more consistent platform usage. This is a bit like the E-C turnback at Chatswood (arrive P2 - siding & walkway - depart P3)
As described in another post, signals between Wahroonga and Hornsby are also being altered, for as yet unclear reasons. The fate of the very slow 8km/h scissors crossovers just south of P1 & P2 is unclear. See: https://www.railpage.com.au/f-t11382536.htm