Caption says Loveland in 1958, but the 638 sat in Denver after it came down from Leadville in 1958, until 1960, when revived for excursions. My guess is this is Longmont sometime between 1960-62:http://www.toltecimages.com/trains/later%20images/0638.jpAnd the 641 on the Climax line, sometime after it was sent there in 1958. It operated there until 1962:http://www.toltecimages.com/trains/later%20images/2641.jpg