Long-term a better service pattern would be XC to Leeds always terminating there with a Scottish link being provided by going ahead with extension of a TPE service with minimum 5-car sets. Also have all (Manchester-) Huddersfield-Wakefield trains run through to York providing a wider choice of northward connections for Wakefield passengers than will ever be possible at Leeds. It would be a big improvement for Castleford too.
But all this discussion is about possible changes that are some years away at best. In the meantime we need to elect a government less hostile to rail and hope that XC can so completely wear out the Voyagers that their replacement by longer trains will become a no-brainer. It's also possible that some changes become easier due to the gradual elimination of all the separate TOCs.
I think Newcastle and Edinburgh losing connections across the Western half of England would be a bitter pill, but in such a case, could it even be an idea to extend an LNER Leeds service to Edinburgh? Akin to Avanti via Birmingham, therefore giving the highest amount of capacity possible and leaving TPE to Northern England? I fail to see why they even need to run the Newcastle - Edinburgh service if I'm honest.
Neither easy nor cheap in reality.
Sadly you can’t go around knocking down buildings without great expense (including relocation costs). There’s also the graveyard at Leeds Minster to consider. The only way around that is a cantilevered viaduct which will cost far more than a conventional structure. You also have to buy very expensive city centre land in the centre of Leeds for your widened viaduct.
Then at the end of the viaduct you’ve got a cutting with Neville Hill access to consider. It’s vital access to here is retained with the associated loops to keep ECS moves off the mainline so no room for 4 track running there unfortunately.
East of NL has the 4 track potential but the pinch point before it makes the idea of turning yet more IC trains nigh on impossible.
I mean easier than Castlefield, Brum to Wolverhampton and the Edinburgh Eastern approach. Leeds would be easiest in construction terms, but not a proverbial easy project. Leeds is the only major city I've acutally never been to and I didn't notice the graveyard, which I assume is St Johns Park?
Considering TfN wanting to upgrade the railway east of Leeds for NPR, if we had a government that genuinely wanted to do these things, in principle, this wouldn't be too difficult to do. Expensive? Yes. But if this was Germany, and considering the likes of the great expense at Stuggart and Köln Hbf expansion for S-Bahn, it would've already been sorted. In fact, Leeds-Bradford would have a region-wide S Bahn. It always feels like there's always a reason to say 'no' and then we wonder why the UK economy is stagnant. You'd never believe we managed to six track railways into London and I would say this would be more important for the
Leeds City Region than a tramway.
Access to Neville Hill and the loops while 4 tracking the viaduct seems like the biggest headache to me. Again, I don't know the area well, and it's going off topic now, but if the money was forthcoming, could we make better use of the freight sidings on the south side of main railway passing the depot, where on satellite looks like there are coal hoppers resting? Not rid of them entirely but rationalise the number of roads? Then 4 track out east. Given enough money, Network Rail can surely figure out a solution.
The solution is not solely an infrastructure one. Currently a lot of capacity on these two track sections is wasted by 2/3 car trains. It would probably be cheaper, easier and quicker to invest in enough rolling stock which could provide more capacity per train path. These two track sections aren’t exactly full, it’s more that the capacity is poorly utilised.
True, I always think 2-3 car trains in the North and West Midlands and 5 car Intercity trains in general, are a waste of capacity and a bizarre one on a railway that has bottlenecks all over the place.