For me it has to be Penrith - Keswick,
Penrith to Keswick - support policy to reduce car traffic in Lake District
There's a policy?
Might be nice, but just putting the fast, frequent bus service into the train timetable and fares system would be a start. The bus service there is an oddity as it runs almost as fast as a train would as pretty much the entire route is on dual carriageway (though it strays off to serve a few villages).
The Lake District is badly in need of a more railheads, particularly now since gaining its UNESCO status as visitor numbers were predicted (pre Covid) to drastically increase.
Keswick is far more cental in the national park, it would also take the pressure off the Windermere branch.
Weather or not the branch gets any kind of capacity enhancements Windermere Station is now nowhere near big enough to cope with the number of passengers it normally handles with a narrow platform and very little room for any kind of expansion as all ex-railway land was sold off around the current station.
There maybe arguments that the current bus service from Penrith is adequate but the A66 is an extremely busy road, is prone to hold ups, continually switches between single & double carriageway, which is dangerous in its self. But away from the A66 most other roads are narrow & twisted and choked with traffic especially in the height of summer.
The bus service has been advised as a connecting service since the railway was shut but I think doesn't attract many because its a bus service.
To me Cumbria County Council and the National Park Authority seem to have burried their heads in the sand as far as public transport is concerned.
It has been said that the reopening of Penrith - Keswick wouldn't cost the County Council a penny but they won't put their name to it.
The National Park Authority won't support it because it means having to divert footpaths which run along the trackbed.