Actually the Central Line is above ground in the vicinity of OOC and there's plenty of land available along most of the likely alternative route, since it's mostly park, so the cost of diverting it should be reasonable. It would probably mean you'd either lose or have to move East Action station though.
This is ridiculous. It’s protected land and there’s still plenty of houses in the way. Then where do you go after? Close North Acton too and bulldoze a load of Park Royal?
Surely the only option physically possible for the Central Line to serve OOC would be if there was a third western branch, veering north between East Acton and North Acton - and either simply terminating at OOC or continuing along one of the myriad rail routes west and north of there to give somewhere else a tube connection too. Fun for crayonistas, but unlikely to work in terms of the overall capacity of the Central Line...
This is the Central Line (red arrow) all the way from North Acton to the site of OOC station (blue). I don't see a single house in the way.
But it doesn't get the Central Line actually to the OOC station site - unless you have a
west-facing spur from OOC onto the Central...
If you managed to add a station on the curve under the bridge taking the Central under the Paddington main line (the nearest point), it would still be another long-distance trudge from the main OOC site (like it would be to any Overground link station currently proposed).
If only HS2 could feed trains into the Elizabeth Line, with calls at OOC, central London and terminating at Stratford (for Europe)!
So much more connectivity, value for money in the Elizabeth line for those of us in the provinces, direct connections to HS1, and no need for billions of pounds investment in Euston.
Though this might not leave much capacity for existing Crossrail route services... (even if the rather significant height difference at OOC weren't an impediment). The [a] Stratford problem, of course, is the need to connect via a long schlep through a depressing shopping complex to reach the "international" platforms.
I have suggested elsewhere (and probably not one to discuss here) HS Wales and West and HS East Coast.
The latter would have a new central terminal as well as new hub (similar to OOC) in the suburbs before heading to Cambridge and then northwards.
However the Wales and West wouldn't have central terminal, but would ruin from the west to Old Oak Common, then into the East Coast hub and through to Stratford (for HS1) in doing so would create a link between the three HS lines without needing to go through the mess which is Central London.
How would trains get from OOC to the East Coast hub, other than via London? Or do you mean there's be a new (outer) north London bypass line??