Here is my controversial suggestion to increase capacity on the Hope Valley line:
1. Increase the number of carriages on each passenger train to eight or more
2. Choose one of the intermediate stations (Grindleford-Edale) to be developed as Hope Valley Central and close the rest. Run a network of mini/midi buses in the valley to and from Hope Valley Central.
3. Run 2tph between Sheffield and Manchester [extended either end as appropriate], with one stopping at Hope Valley Central
4. Divert the Nottingham-Liverpool train to run via Derby, Chesterfield and direct to Hope Valley Central. Replace the Nottingham-Sheffield via Alfreton section by extending another service. (from Norwich or Leeds?)
5. Sort the junction(s) at Dore
6. Resignal the line to permit closest headway of trains.
7. Electrify.
Much cheaper and less controversial than re-opening the Bakewell route, and plenty of freight train capacity.
Okay, if lists are the way forward, here's my suggestions:
1. Four track from Sheffield Midland to the junction at Dore
2. Four platforms at Dore, enabling regular connections from the MML to Hope Valley without needing to go into Sheffield and back out again
3. Replace the current "Regional Railways" services in the area with a half hourly Nottingham - Leeds and a half hourly Manchester Piccadilly - Doncaster (extending hourly to Cleethorpes/ Hull), making things more reliable, focussing on running services in relatively straight lines (rather than the current Norwich - Liverpool, Nottingham - Leeds, Sheffield - Hull, Manchester Airport - Cleethorpes, Leeds - Lincoln), more resilient in the event of anything going wrong
4. Increase the length of these services to at least 6x23m (or equivalent)
5. Forget about some of the current links between places that are over an hour apart (e.g. Liverpool to Nottingham) - we can't link everywhere to everywhere, we'd be better focussing on reliable services within regular commuter distances.
6. But what to do about the Hope Valley stopper?
Since the Hope Valley stopper eats up capacity, it has to be incredibly carefully timed - for example, it takes 41m westbound from Sheffield to Chinley, so leaves civilisation just a couple of minutes after the westbound TPE but gets to Chinley just ten minutes before the westbound EMR (which takes around 24m to pass Chinley). At around 75m, it's of essentially no use for Sheffield - Manchester passengers (unless the long distance services collapse, but then, by having such an awkwardly pathed stopper, you are inviting the longer distance services to become unreliable!).
So, the two options are either...
...introduce a half hourly skip-stopping service that aims to do the journey in closer to an hour - i.e. extending all of the Piccadilly - New Mills services through to Sheffield - so that there's less scope to delay the longer distance services, and by speeding it up you might attract some passengers from the longer distance trains. Looking at the annual passenger numbers:
- Dore: 199,000
- Grindleford: 58,616
- Hathersage: 68,642
- Bamford: 34,526
- Hope: 68,820
- Edale: 93,860
- Chinley: 129,000
...so everything stops at Dore and Chinley, maybe Bamford goes down to bi-hourly, maybe Hathersage/ Grindleford get a half hourly service to/from Sheffield in the direction of the peak flow but drop down to hourly at other times. Edale gets a half hourly service on weekend mornings but drops down to bi-hourly at quieter times (given the obvious "walker" demands).
*OR*
...you give up on the idea of a stopper from Sheffield to Manchester. Run a half hourly stopper from Sheffield to Hope, that then sits in the freight sidings west of Hope station before heading back to Yorkshire. Run all Piccadilly - New Mills services to Chinley. Replace the service to Edale with occasional stops in the longer distance services (which occasionally also stop at Hope/Chinley for connections). But, that means that the Sheffield - Hope service doesn't have to match up with the Chinley - Manchester service, so that clears a lot of space in the timetable, making things much more reliable
(or, go crazy, stop the digging up of so much of the Peak District, which would remove the quarry trains from the timetable - some enthusiasts are so emotional about trees cut up for HS2 but perfectly happy to despoil a beautiful part of the English countryside so that we can have some rocks for building projects elsewhere)