Ok I'm surprised my error slipped through so quietly. 90km/hr faster, not 900km/hr
I missed it. I saw the 900k/hr and thought you were talking about planes again so I switched off .
Ok how to solve ...
A bit off topic, but the problem and possible solutions all show the problems of the metro via Bankstown: it creates as many capacity problems as it solves.
- All Canberra MSR's should run via Airport, but Southern Highlands not so.
The only way that can happen at the moment is for a new hybrid train that can use the overheads in the Sydney network and that could then use the city circle to make a U-turn and head right back to Canberra.
Running MSR around the circle is problematic. The trains would need a non-standard fast loading/unloading format, to limit dwells to ~50sec. This could not be done without seriously compromising the MSR's design.
I was working on the basis the CBR service done in MSR would be sparked. I know there are some non electric platforms about, but most - and certainly all you would regard as "standard" - are EMUs.
If MSR trains do run via the airport, then by necessity some trains along the East Hills will need to run via Sydenham (at least post Bankstown Metrofication). In fact I think post Metro, most trains on the East Hills will run via Sydenham, if it's possible of course.
So assuming above is ok to g via the tunnel.
- North of Mascot station, the line goes to the right, north is Sydney Park the South Coast line nth of St Peter's comes from west and head north, the tracks can be easily joined by a 2.7km long tunnel.
If only for CBR train, it could be a just a single track tunnel.
ESR takes east/south tracks so need to surface north of St Peters Station on Western side using the available corridor.
I'm thinking outloud so open to correction,
Really? With all that tunnelling I thought you'd let Eddy use your account .
Plan A. The ESR junction would no longer be a junction ...
Plan B would be to slew the Western pair of tracks ...
The bottom line is there are 2 routes and 2 track pairs approaching the eastern City Circle track pair. It's impossible to fully utilise them. The western arm (potentially) feeds only the inner west, and the City Circle can't be fully utilised. The Bankstown line makes used of some of the capacity created by this inequality. But the Sydenham alternate route allows load balancing of the two arms of the circle.
Even though this is a mess (and the metro makes it a bit worse), the fact it is a mess means there will be gaps in the timetable to thread non-circle trains through. The issue for MSR is terminal facilities.
I should give a brief description of how I think it could work.
- CBR/Highlands MSR trains terminate at platform 21 (and/or 22).
- Stop IntAir-DomAir-Revesby-Glenfield-Cambo -> on to whereever.
- Their transit from Central to Campbelltown would be ~40min vs the fastest suburban train of ~45min.
- With a scheduled overtake at (or about) Glenfield, this could be cut to ~30min. You'd have to quad Revesby to Cambo to get it down to ~25min (2 overtakes), and eliminate all local stops to get it even lower.