But that CG Railway is private enterprise moving trains between North and South America. But damn you, you got me curious too.
Yes the US Navy has trains, with yellow engines and gray rolling stock. The largest is in Crane, IN, at the Navel Surface Warfare Center there.
There are smaller ones around the country, at least one in NJ and a couple in CA, I could find. The locomotives are mostly electric or diesel/electric, so don’t toot-toot like Popeye. They are all involved with moving things that go boom. Moving munitions from inland stores to warships in port, or around various munitions storage and testing facilities.