Not many journeys to or from the Chat Moss to Salford Central.
It would be better to provide 4 platforms for the line to Windsor Bridge Jcn, with turnback facility on the central two platforms so services can be pushed through Victoria to terminate there. But I'd also be looking at doing somthing USEFUL at Salford Crescent, you know, more platforms, moving it to the North of it's current location, ANYTHING!
As for tracks on the Chat Moss route, if what I had planned for it came to fruition there wouldn't be space. As a matter of futureproofing, I'd have four tracks running down the Chat Moss.
As most sevices from the Castlefeild Curve would be running through victoria, and a reasonable amount from the Chat Moss terminating at the new Exchange platforms. I would have some lovely 4 track.
The Castlefeild Curve would either, 'curve tight' onto the Current Chat Moss viaduct tracks (the one by Trinity Road), with a new bridge / viaduct over Ordstall Lane Junction being provided for the Chat Moss - Victoria flow. Running on the Trinity Way side of the viaduct as 4 track all the way to Deal St, possibly all the way upto Victoria.
The through tracks would run as,
Salford Central -- Victoria Pt 5 & 6
Castlefeild Curve -- Victoria Pt 3 & 4
Chat Moss -- Exchange Platforms & Pt 3 & 4
Everything through Salford Central, currently 6tph, if we see sense and put the tracks back to Leigh, 8tph, allowing for more Bolton services, 10tph. Would all run through Platform 5 and 6, And with some more wires onto either Rochdale (Or beyond) or Stalybridge. Wires to Stalybridge I'd see as having Diesels sent to Rochdale as stoppers (With new west facing bays) and Electrics sent to Stalybridge or possibly Ashburys (both with new bays).
Everything on Platforms 3 and 4 would be running through anyway, as it would be used by TP Express services (4tph, extend Hull - Manchester to Chester via Warrington) Calder Valley - Airport services (2tph) and possibly Liverpool - Norwich Services (1tph), and maybe a Liverpool - Manchester extended to Stalybridge.
1 and 2 as is, although their use would decline as Calder Valley Stoppers would be formed up from Wigan via Bolton services. Only really seeing Huddersfeild - Manchester (Although that will proberbly go to Piccadilly), and if the 4 tracking happens on the Diggle Route, the semi fasts over that way, 2tph.
Anyway, it would also mean that what would be a lot of crossing movments on one flat junction would be reduced, with 6tph being taken over the top, 4tph from Castlefeild Jcn to Victoria, 4tph from Castlefeild Jcn to Windsor Bridge and upto 2 tph onto the Chat Moss if kind of the limit. Take the 6tph from victoria into this aswell and it seems stupid, the viaduct will proberbly be needed and if it isn't built now it will be a mistake.
Anyway, with 8 tracks through Salford Central again you'd be hard pressed to find platforms for the Chat Moss.