I think an additional through platform would be of far more value than terminating Bays (alongside platform 6?) in the long term & perhaps give Victoria a much needed extra through line that would benefit capacity both East & West. I can't understand why the layout wasn't designed also with a platform avoiding through line for freight, the diamond crossovers unquestionably make the respective platforms more flexible, even if they seem like an afterthought. I've heard the Victoria layout maybe altered in some fashion with electrification, but I need to hear more details, as I'm not sure what they have in mind..
Its a shame they can't shift the main entrance to the Arena elsewhere & then be able to remove the 'concrete roof' which would enable the new roof to be extended perhaps over the through platforms so we'd have a through section looking more like Leeds & less like Birmingham New Street!
Also, I appreciate Red Bank sidings may never exist again, but there's certainly room for some potential EMU/DMU stabling sidings at the site of Newtown Carriage Sidings, if needed, plus you've got crossovers to each line already in place before this is reached without the need for additional trackage.
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Well, I'd re-route the Metrolink so that rather than crossing through the middle of the old trainshed with all the space that wastes, it skirted around the edge before rejoining the alignment towards Central Park/Bury/Rochdale. Even better (but subsequently more expensive) would be to drop the Metrolink into a 'cut&cover' tunnel (or elevate it onto a flyover) to completely grade-separate the two systems as is the case at Piccadilly.
Of course, the total area of the 'old' station area is far bigger than would be needed- but if 2-3 extra bay platforms suitable for 8x20m stock (possibly realigning the existing bays too) could be provided this would allow for future growth. I fear that if usage continues to grow at current rates (possibly faster with all the investment) that Victoria station will once again become a bottleneck. I always thought the current situation with the way Metrolink is arranged looks like it was rushed, ill-planned, and never intended to be permanent!
It will become a bottleneck & probably is already, when I go through, Wigan - Rochdale 'stoppers' are regularly held at lights at Deal Street waiting for the Blackpool to clear platform 6! It was clearly redesigned when the huge growth in rail travel was not forseen & when freight became less, many local suburban trains were almost doubled in frequency to take the paths.