My thoughts for an improved York - Leeds - Manchester service
4 trains per hour with more carriages, 6 minimum = More robust timetable with less delays, also less recovery/dead time.
4 tracking at some stations, Dewsbury and Crossgates could easily have 4 tracks, Slaithwaite would take a bit more work, but there is space. Mirfield would take a bit of work as well, and that section could be 4 track from Colne Bridge to Ravensthorpe = Less expresses stuck behind stoppers.
Speed increases where possible, may only be 5 or 10mph, but every little helps.
These improvements could be delivered fairly quickly (compared to HS3) My question, in keeping with in these parameters, with 100 or maybe 125mph expresses what Journey time could be acheived between Leeds and Manchester?
Then go for a series of further incremental improvements, introduce tilt, longer platforms to increase to 9 or 10 carriages.
The problem is that HS3 or whatever it ends up being will take to long, improvements are needed now.
The current solution, 6tph with semifasts calling at minor stations is just a bodge, Long distance passengers want fewer stops, local passengers may want one of the skip stop stations.
Finally proper intercity stock on the Newcastle - Liverpool expresses, with 125mph capability to allow easier pathing and faster journeys north of York, and no doors in the middle of the carriages, the hot cold hot at every station is uncomfortable on a cold day