OK, some updated diagrams ....
... and ...
I think the wording of the published plan is hedging it's bets on 24tph across the bridge. The fallback would be to run 4 tph from the west into ST, so half the northern line trains, or perhaps some western line trains.
I also think the plan really means 24 tph on the suburbans and 20 on the locals between Strathfield and Redfern, vs the 30 now, That's how I reconcile the 14 extra trains, and the "up to". It's dependant on ATC delivering the 24tph across the bridge in DD format.
I think they just they've just ignored how to deal with the inner west. They've made it very clear they are going to run 20 tph along the airport line, and the airport line can't turn trains through the circle. Perhaps that could be fixed, but I doubt it. Once the Bankstown line is handed over to metro, than means 20tph along the inner west, and dealing with all those closely spaced little stations. They could simply be rationalised (closing McTown, Stanmore, Lewisham and Croydon say, or perhaps more), and I can understand why that wouldn't be published in the plan, or they could just add another 12 min to the running time from Liverpool. Or they could turn some trains at redfern (ie "up to" 14 extra trains).
But that's what I think they mean.
I think it's up in the air as to whether or not they will run trains out the Richmond Branch off Sector 3. It could be done as shuttles with all other western line trains running to Penrith. Quite frankly I don't see much advantage in this, but there sure is extra cost (Richmond Line capacity is essentially duplicated, once on the branch and again on the main to Penrith with lightly loaded trains) for the benefit of stopping pattern "simplicity".
It should be noted that all previous proposals for a 3 tier system included the inner west as part of the inner tier. That's been scrapped, and the mains have been preserved for "NSW Trains". Prior to this, the apparent intention was to OSCARise the interurban operations and run them through the city, with sector 3 eventually being moved entirely to the mains.
Perhaps somewhat ironically it will be the metro with the multiple stopping patterns by the time this plan is fully implemented.
Now, does anyone have any major objections to this interpretation of "the plan" ?