Bradford Crossrail is a great scheme, and while not imperative to the wider rail network, it is probably the best infrastructure project for Bradford as a city that we could build. It would also have some pretty handy outcomes as well.
The best version of the project, is the building of the Forster Square-Interchange line, with both stations demolished & a new station on Forster Square. This station could be directly linked in to any new retail development, as well as have a walkway to the existing bus interchange.
The scheme would also include re-opening Low Moor-Thornhill Lees via Cleckheaton, Liversedge & Heckmondwike (The Spen Line) as well as Laisterdyke-Low Moor (the Bowling Curve) with a new station at Wakefield Road, on the edge of the city centre.
Lastly, it would involve significant electrification of the Caldervale line, from Leeds to Huddersfield via Bradford, Halifax & Brighouse.
This would result in:
-Airedale terminators continuing to Huddersfield & Wakefield, giving better cross-city connection
-making Bradford CC more accessible from a range of locations (Huddersfield, the Spen towns)
-Making Bradford a natural stop on through trains (e.g. to Carlisle, going via Pudsey & Bradford instead of Shipley)
-reducing time penalties for reversal on trains into Leeds from the Calder Valley
-separating out Leeds-bound & Bradford-bound trains.
-allowing Leeds-Bradford services to run as a Leeds-Bradford-Leeds loop, freeing up paths
on the civic side of things, it puts Bradford back at the centre of a commuter network that has withered and died in the last 30 years. Given the above would allow not only long-distance trains to Manchester, but also more local stops (places like Low Moor, Hipperholme, Manningham, Laisterdyke etc.) it would make Bradford CC relatively easier to get to compared to Leeds CC. Given the way Leeds has siphoned off Bradford's natural commuter and visitor population, this is vital in order to get Bradford back growing again, which it hasn't done for a decade now.
I'd add that this could involve other works (e.g. wiring to Manchester via Hebden Bridge, re-opening Platform One at Halifax), but it would allow significantly more trains from Bradford to Huddersfield & other areas, as well as allowing stops to be dropped on fasts. So given Leeds-Bradford and Leeds-Halifax could be served without running the length of the Caldervale, Victoria services could be cut back at Bradford, calling Halifax, Sowerby Bridge, Mytholmroyd, Hebden Bridge, Todmorden, Rochdale & Victoria. A turnback at Todmorden would allow Leeds-Todmorden services to go via Dewsbury (hugely reducing journey times into Leeds for the Caldervale towns), and 'fasts' could then be introduced from Bradford to the west (i.e. Halifax, Todmorden, Rochdale, Victoria, Newton le Willows, St Helens Junction, Liverpool Lime St)