The claim: Currently being used as a storage facility for United Nations vehicles and equipment. Observers have seen this material brought in on the Whitesands rail spur in Oro Grande New Mexico about thirty miles from the Texas, New Mexico Border.
What it really is: White Sands Missile Range is the largest military base in the United States and is used as the military's and NASA's primary rocket range, and is the site for the Orion Project Launch Abort Flight Test Complex. Several areas there are also National Historic Landmarks and Sites, thus open to the public.
So far there is no evidence at all to confirm that any vehicles or equipment used by the United Nations is being stored there, and these claims go back at least as far as 1999 from what I have found. In fact it's the exact same claim, word by word.
Also, Oro Grande (spelled Orogrande) does not have any rail going through it, and is very small (it has only around 50 people).