From de comments, a solution that would NOT have paid AN AWFUL LOT OF people A LOT of cash.
John Burns London, United Kingdom 2 hours ago
Remove the bottlenecks on the WCML, build the WCML Stafford bypass, make it 4 track from Winsford to Weaver junction and make all trains run at 140mh. The trains can run at 140mph but the did not implement in-cab signalling. That is all that was needed. Upgrading the Chiltern Line put the Birmingham trains back on that line releasing capacity on the WCML. All is there, without batcaves.
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