There is one of these at the US Navy Yard museum in Washington DC: http://upload.wikimedia.org/wikipedia/commons/thumb/2/2a/US_14_inch_railway_gun_Washington_Navy_Yard_1993.jpg/800px-US_14_inch_railway_gun_Washington_Navy_Yard_1993.jpgNot WWII. My favorite peace of military rolling stock, Admiral Plunkett's Navy with their 14-inch gun!
Any chance you took photos? I'm sure I'm not the only here who'd love to see them!I visited the Ft Eustis museum again
this weekend. Their new train pavilian is nice and there are lots of railroad displays throughout the museum.