Is Crewe to Manchester or Stoke to Manchester four track?
Crewe - Manchester : currently 4 tracks Crewe - Sandbach, but no way of getting onto slow lines except from Crewe avoider (some idiot took out Sydney Bridge Junction a couple of years ago), loop at Chelford and Styal line available as alternative from Wilmslow. Four tracking probably not justified, but I would reinstate Sydney Bridge, loop near Goostrey, extra platform at Alderley Edge (to get terminating stoppers out of the way), reinstate loop north of Handforth, and 4 track Stockport - Cheadle Hulme.
Stoke - Machester : currently 2 tracks all the way. Ideally I would 4 track Kidsgrove - Stone, though Kidsgrove tunnel(s) would not be practical.
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Dr Days Junction to Filton.....I know hindsight is a wonderful thing but a very short sighted 1980's de-quadrifying IMO.
Scandalous if you ask me, and I thought so at the time.
I also agree with
Birmingham - Coventry
Coppermill Jcn - Broxbourne
Stalybridge - Huddersfield
Mirfield - Leeds (except Morley tunnel !)
Leeds - Micklefield
Tyseley - Dorridge
also
Wolverhampton - Birmingham
Kettering - Bedford (3 tracks is SILLY !)
Derby - Burton on Trent
Winsford - Weaver Junction
Didcot - Swindon (?)