I suspect war with Russia would bring this on, but not a lot else would.
This might actually benefit the Far North line - there might be a military benefit in bringing materiel that far north which can't be shot out of the sky and which is kept off the roads. It might depend in part on whether such a war is fought in any conventional way, or entirely by people pressing buttons in windowless rooms. (This is speculative discussion after all.)
I agree it wouldn't benefit any route without some as yet unknown military purpose.
It would have been interesting to see what would have happened if BR had attempted to proceed with the attempt to divert the Newquay branch to St Austell via St Dennis in the 1980s and close the route from St Dennis to Par, closing Luxulyan, Bugle and Roche stations in the process. It would have given Newquay a service to somewhere people in Newquay might actually want to go all year round (rather than a village requiring a connection to everywhere else) and likely sped up journey times as a consequence of joining the main line sooner. I think the proposal was also briefly revived in the mid-2000s, but again didn't go anywhere.
The combined population of the 3 villages appears to be under 10,000. Bugle is on the A391 and Roche on the B3274. Both are served currently by a 2 hourly bus to St Austell whilst Luxulyan is also served by a small number of buses. I suspect there are rather more people travelling by bus to St Austell than by train to Par.
It's also noticeable that on summer Saturdays all stations between Newquay and Par were skipped for many years (although they do now have a skeleton service), indicating that providing a service to them is of little importance if there is a far bigger bulk flow better served by the railway.
It therefore seems to me the advantages significantly outweigh the drawbacks - it would have given Newquay, at the end of the route, a useful all year round service whilst also allowing faster journeys eastwards. Three villages would have lost services but could be easily served by buses taking them to the one place they are most likely to want to travel (St Austell) with onward mainline connections, rather than having to wait at another village for up to 30 minutes (previously an hour) in each direction if they wanted to go anywhere other than Par.
It didn't progress, but if it had you'd probably have had the usual objections:
- It's the thin end of the wedge (ignoring the fact that BR were opening a line to replace it)
- It will cause severe economic hardship for the three villages due to the vital revenue the railway brings in to the villages
- The three stations are 'well used' ('well used' not defined)
- There is someone in one of the villages who travels every July to visit a relative in Wakefield on a cheap advance ticket with a railcard, bringing in vital revenue to the railway once a year
- 'I came to this meeting to object to closure in my car and I've never actually used it, but it's vital the line stays open because one day I might think about potentially using it if the stars aligned'
Some might try to argue both lines should stay open but the chances of any public body with control of the railway's finances approving two separate lines across a rural part of Cornwall to serve a town of 20,000 people with very seasonal traffic are frankly non-existent.
I'm not advocating the closure of village stations, just highlighting that they should only be served if they don't impede the railway from serving more significant flows to larger settlements.