Also lost space with cabs, extra disabled toilets, and the carriage connections. All adds up.
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What I would be interested to know is was any work done to look at grade separation of any of the junctions around Manchester as part of these works? When you look at how quickly DB get trains in and out of say Cologne you look and the vast majority of the junctions are grade separated in some way, removing all conflicts. Seems to me even removing conflicts at 1 of them would be helpful. I sense the cost would be too great to justify in this country but hopefully the amount of grade separation going on down south might one day infect up north.
Don't know if anything was considered, but I would have thought it unlikely.
Slade Lane Jn has been talked about on and off for decades.
The only other remotely feasible one would be Ordsall Lane Jn, by running the ex LNWR lines from Salford Central at a higher level and demolishing a few overbridges. Enormously costly, enormously disruptive.
There's a redundant viaduct at Deansgate but I can't see how to connect it to Oxford Road.
Unfortunately, the UK has never had a Prussian-style Ministry of Defence determined to eliminate conflicting movements and termini to speed up troop trains.