So what did Beeching want to do with routes that weren't "major trunk routes"?
I wasn't aware that Dr Beeching made any further general announcements on the future of lines beyond what was in the Reshaping Report. The Trunk Routes document isn't really an 'opinion' piece, rather a 'planning' document.
I have no idea of the relevance of any of this* to my points. [*About the Trunk Route report not being full of operational detail.]
I was trying to forestall comments about whether the envisaged 1984 traffic levels and speed mix could actually be accommodated on the proposed 3,000-mile Trunk Route network. Also whether the mix of London commuter, Intercity and Freight traffic on the Trunk Routes particularly to the north and west of London was achievable. These are comments often made about the report.
The report would presumably have been well into production by October 1964, and so the idea that it was heavily changed in just four months - to appease a government that as you state closed lines anyway - seems dubious.
I think that that is quite a bold assumption. The main work of the Trunk Routes report was undertaken by James Ness, a very experienced railway manager, including a long stint as General Manager of the Scottish Region and then brought onto the Board by Beeching to head up planning work. The planning function had been through quite a lot of turmoil over its role and interface with the regions and functions. There are various indications that it was completed in quite a hurry. It was published on 16 February 1965, only just before it was confirmed that Beeching was returning to ICI a year early following a failure to agree new initiatives with Tom Fraser. (The exact circumstances behind Beeching's departure are shrouded in mystery.) Beeching had obviously been very busy with lots of other works such as getting the Bournemouth and Glasgow-Gourock/Wemyss Bay electrifications through Ernest Marples before the general election, preparing for the launch of the British Rail corporate identity from January 1965 and getting ready for the launch of the new British Rail Research setup at Derby later in 1965, etc.. Whilst he was evidently happy to 'own' the report I am far from convinced that he had much personal input to it.
And your evidence that a Tory government would not have closed those lines is...? We know Fraser and Castle rejected proposals for the closure of a great many lines.
I wasn't aware that I had made any comment about what a (further) Conservative administration or ministers might have done.
For the record:
Subsequent to the Reshaping Report (RR) Beeching presided over 145 proposals to ministers that led to withdrawals of passenger services (some for lines and others for wayside stations on routes that would remain). Of these only four hadn't been listed in the RR. 1,326 miles of route saw passenger services withdrawn. Obviously this covered both Marples and Fraser.
The next Chairman, Stanley Raymond, appointed by Fraser, presided over 166 proposals of which 47
hadn't been in the RR. This led to withdrawal of services over a slightly higher total of 1,333 miles. Most of these occurred under Barbara Castle.
The next Chairman, Henry Johnson, appointed by Castle, presided over 96 proposals of which 43
hadn't been in the RR. This led to a further 877 miles of withdrawal. The covered cases under Castle, Marsh, Mulley (and a few under Peyton in the post-1970 Conservative administration).
Marples had accepted 141 proposals (some with modification) and rejected only 7. (The rejected ones did include Wick/Thurso, Kyle of Lochalsh, Ayr-Stranraer and Stockport-Buxton.) Some 1,436 miles saw services withdrawn.
Fraser accepted 88 proposals and rejected 9, seeing 819 miles subject to withdrawal.
Castle accepted 91 proposals and rejected 18, seeing 606 miles subject to withdrawal.
Marsh accepted 47 proposals and rejected 8, seeing 419 miles subject to withdrawal.
Mulley accepted 15 proposals and rejected 3, seeing 227 miles subject to withdrawal.
Subject to any errors in my maths, I think that that makes 2,071 miles closed under the 'no major closures' government, in response to 241 submissions from BR, most of them from their own appointees and a rejection of a total of 36 proposals. However, there were 90 'extra' closures from their own appointees. [Johnson straddled two administrations.]
I really would encourage you to read Terry Gourvish's
British Railways 1948-73 - A Business History in detail. It is 781 pages of pure gold. And reading the Reshaping Report and the Trunk Routes Report with fresh eyes and an open mind too.