Narrow Gauge Railway Gun?

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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?
 
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?

The weight of the rail and roadbed is the determining factor on the weight of the rolling stock, not the distance between rails.

so yes, you could lay 140 pound rail and have 18" 'London Lenny' fire across the Channel, while it technically being 'narrow gauge' line
 
Something like this?;)

dd8a754bad1789e0e2b7caca8c41c6c4.jpg
 
Thanks and please lock.

Thanks to the couple of posters who commented on this thread.
If a moderator could please lock it, since I can't foresee coming back to it in the immediate future, and there seems to have been little interest in it?
 
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