alternatehistory.com

Another Thread ( https://www.alternatehistory.com/discussion/showthread.php?t=356349 ) recently posted has reminded me of the existence of the Romney, Hythe, and Dymchurch Railway, on the south coast of England - a 15" gauge line.
Apparently during WW2 the line had an 'armoured train' equipped with Lewis Guns and an anti-tank rifle. ( Wikipedia page at date of this post includes a picture of this oddity. )
If someone during WW2 had had the time and inclination, would it have been possible to develop a 'railway gun' for this line (presumably to take shots at any incoming Axis invasion shipping), and if so what calibre a gun (with what range) would it have been possible to mount?
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