Surf,California--on the Pacific Surfliner line. Just a small blacktop siding, a narrow two-lane road leading back to civilization inland, and the beautiful Pacific Ocean and crisp white sand dunes immediately to the west. The most naturally scenic and unspoiled stop anywhere on Amtrak, where the salt air permeates the coach interiors each and every time the PS stops!
What about the great deserts? The Rockies in Montana? The Appalachians in West Virginia? Many parts of those are virtually unnspoiled and even unpopulated.
If you read my post accurately, I was describing the Amtrak stop that I believe is the singlemost unspoiled, natural location on the entire rail network, with no infrastructure or civilization around to speak of.
Of course, the regions of the Rockies, the Southwest Deserts and other American rural environments have pristine areas. But please read the post and note that I am speaking about the specific station locale.