Yep - - - CB&Q all the way! 2-10-4's shown, which were rebuilt in the late '30's for Lincoln-Denver fast freight service (max 55 mph), seen in passing sidings. Judging from the terrain, think it was photographed in eastern Colorado. Additional clue: steel coaling tower, which replaced older wood, ramp-style coaling dock. Steel coaling towers were seen on the McCook and Alliance Divisions of the Q, particularly in the following Nebraska locations: Red Cloud , Holdredge, McCook, Benkelman (home town of Ward Bond, Wagon Master on tv show "Wagon Train") and at the following Colorado locations: Wray, Akron, Brush, Roggen, and Denver.