Union Pacific EMD F-3A 1430, with GP-9 B unit 143B and F-7B 1470B following, bring their train from the east into the yard at Laramie, Wyoming on August 15, 1957. Unit 1430 was built in 1948 and retired in 1964; 143B was delivered in 1954 and retired in 1978; and 1470B entered service in 1951 and was retired in 1964. I took this photo from the long footbridge over the UP's Laramie terminal and yard trackage.