I had an idea many years ago for the re opening of the ex cheshire lines, although i have seen several proposals over the years, ive never seen this particular idea, with a branch near hartleys hill Aintree along the old clc to hunts cross, which could also have the lines from walton through kirkdale and sandills (marked yellow) reinstated to 4 tracks if needed.
with regards the edge hill tunnels, i think the victoria and waterloo tunnels is a good idea.
i think the wapping tunnel on top of having a stream running nearby which causes water problems, is also built to a very tight loading gauge, Ive been told by ex railway men that 2 trains where not allowed to pass in the tunnel, such was the tightness of it, its one of the oldest railway tunnels ever, and the loading gauge is down to the size of locomotives at the time.
Mike
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