I hope this won't get me on a list, but I have confirmation through others that Earle used to have nuclear weapons. A family friend is a firefighter in the area, and has been one for a long time, as he started during the Cold War around the 70s/80s. This family friend said that every so often they would do drills/trainings at Earle, and that if certain areas (with the nukes) of Earle were on fire, to prioritize those areas over others, and if the fire was uncontrollable, it was best for the local fire departments to run like hell and get as far away from Earle as possible. This family friend also claims he was shown what the nuclear weapons looked like (he said he saw them on whatever launching system they were on), but I'm not sure if I believe that.
I'm not sure exactly why Earle was so quick to tell some firefighters about where the nukes were, but since this was the 70s/80s just outside NYC, I'm going to assume the DoD knew the Soviets knew Earle had nukes and where they were located, and figured it didn't really matter anymore. Earle also had anti-nuclear weapons protests outside of it in the 80s, so it was not a secret.
Also, Earle no longer carries nuclear weapons. After the end of the Cold War, the US Navy removed nuclear weapons from their surface ships, and keeps the nukes to the submarines. AFAIK Earle does not supply submarines. If things continue heating up with China, I will not be shocked if the Navy puts nukes back on surface ships, and we see the USMC guard detachments again.
Going back to the railroad, I would not be shocked if Earle has blocked off their entryways into the facility from the national rail network. Earle RARELY gets anything delivered to them anymore, and if they do, it was new engines and freight cars. AKA you only need deliveries of that as needed, like once every decade or so. Not to mention, I'm sure Earle had some sort of legal agreement/restrictions with CR about the access points in Earle, I doubt they have the same with C&D/DRRR, who now operates the line connecting to Earle.