Don't know the website, but your reference to a "stunning rendition of Toltec Gorge" sure sounds to me like a description of a Henry Jackson print with a somewhat "heroic" retouching that places a train about 2,000 feet above the river. A copy of it is on p.16 of Brian Solomon's NARROW GAUGE STEAM LOCOMOTIVES, MBI Publishing, Osceola, WI, 54020.