A photograph postcard showing the Union Pacific (UP) 4001 & 4008, 4-8-8-4's, on westbound freight extra, approaching Sherman, WY, 103 cars, 40 mph (raining).

A photograph postcard showing the Union Pacific (UP) 4001 & 4008, 4-8-8-4's, on freight extra, standing at Borie, WY.

A photograph postcard showing the Union Pacific (UP) 4001 & 4008, 4-8-8-4's, on westbound freight extra, at Granite Canon, WY, 103 cars, 20 mph'

A photograph postcard showing the Union Pacific (UP) 4001 & 4008, 4-8-8-4's, on westbound freight extra, leaving Cheyenne, WY, 103 cars, 20 mph (Hank Griffiths on 4001).

Abstract: An airborne radiometric survey of parts of the east flank of the Big Horn Mountains was begun on June 23, and completed on August 27, 1952. An area of approximately 250 square miles was covered, and only two anomalies were found in the entire area. Flight lines were arranged in accordance with the geology of the area, particular attention being given to formations the stratigraphic equivalents of which are known to be uranium bearing in other areas. Two additional zones of radioactivity were found by ground investigation, but assays from both the ground and the airborne discoveries showed no economic uranium deposits.

A photograph postcard showing the Union Pacific (UP) 836, 4-8-4, on eastbound troop train near Buford, WY, 14 cars, 50 mph.

A photograph postcard showing the Union Pacific (UP) 3524, helping diesels 1419, 1494C and 1450 up Sherman Hill on Westbound freight extra, near Corlett, WY, 67 cars, 30 mph.