As there have been various open questions stated upthread about the future of the network, and I notice that this thread has been recently renamed to “and how should we proceed”, I thought it might help those not fully aware of the current plans and phasing to have a look at the northern layout of Phase 1 and to consider what eventualities might arise from all the continuing uncertainty around the system's future. This isn't intended to add to the discussion around what else the network should / could have been; rather what might arise from the current state of play. Apologies to those who already know all this.
Here is the delta junction in Birmingham.
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The line to the central Birmingham station (Curzon St) is well underway and the TBM logo there is Mary Ann which is +200metres into the first bore.
Another TBM starts next year.
The three-way junction allows trains from the South to go into Brum or to bypass Birmingham on their way North. And vice versa.
The northern arm would allow trains from Leeds / Manchester to go into Birmingham and vice versa.
The viaducts for this are currently being constructed.
It seems reasonable to assume that all of these connection possibilities will be built as there's no sign from current construction works that these plans have been fundamentally altered. It is also worth pointing out that none of this complex construction is necessary if the line is to forever remain a shuttle between London and Birmingham.
The line travels north from the delta junction and there is plenty of well-progressed construction works along this route including the crossing of the M42 (Marston box) and the A38 / WCML dive-under at Streethay.
The northern ends of Phase 1 are the NW spur past Lichfield which splits into two. The more northerly line merges into Phase 2 while the southerly spur links onto the WCML at Handsacre.
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There has been uncertainty around the future of the Handsacre junction. According to
this report, on page 50, there are various configuration states of HS2. Config. D which has Handsacre junction operating separately and distinctly from both the initial OOC->Curzon and anything regarding Phase 2A. This suggests the connection is considered separate to that of the Phase 2 build and therefore a phase 2 cancellation would not necessarily involve cancelling the Handsacre connection. Moreover, in the event of a phase 2 cancellation, as many have said, it would be absolutely crazy not to build this connection as it would render all of the work to build the grade separated viaducts at the delta junction plus the considerable amount of line to the north of the junction utterly pointless.
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So I think it is reasonable to assume that Handsacre is definitely happening if Phase 2 is definitely not. It's perhaps more in question if Phase 2A is retained, although as shown above, the general assumption is that it forms an intermediate stage of configuration that opens up possibilities for trains to the north (although there are limitations at OOC that prevent it from being able to serve the full service spec that Euston would offer).
One open question I can't answer is the status of the NE spur at Kingsbury. Can anyone report any construction on this stretch? In the event that the stump is created, could it become a connection into the line to Derby and could this facilitate some kind of service into the East Midlands / Leeds / Sheffield in the event that the East Midlands link is cancelled?
If I remember rightly, various sources regarded the eastern leg of HS2 as the most useful part of the whole original Y network as it provided capacity release on both the MML and ECML.
Finally, the overall length of Phase 2A to Crewe is only around 2.5 times the distance from Water Orton to Handsacre (the bit that's being built simply to connect HS2 to a conventional line). It also bypasses some slow bits of the WCML and also includes train / maintenance depots and other useful things. So it adds quite a meaningful amount to the usefulness of HS2 and various others have said that in relative terms, this section is reasonably cheap. Plus it already has royal assent.
Perhaps someone with knowledge could shed insight into how much land has been purchased / early works that have already happened for Phase 2A.
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It does seem disingenuous to me for the government to be allowing the cancellation of phase 2 to be seen as a way to save cash in the here-and-now. HS2 is going to carry on costing £billions every year until phase 1 is complete and it's hard to see how that changes if you cancel phase 2A which is already on pause or phase 2b which isn't even confirmed yet.
It seems to be fairly widely assumed that the government are going to allow phase 1 to continue, with even critics grudgingly conceding that the works are too far advanced to cancel.
Whilst disappointing and frustrating to see a project cost more because of delay and interruptions, the long term view is that a significant piece of high speed railway will be built that will retain options for future extensions. Perhaps smaller parcels of extensions to the network will be more palatable / less in the public crosshairs in future.