Alco RF1A #1072
Number 1072 is an Alco RF1A.  It was originally built as an RSD1 in 1943 (builder #70673) for the U.S. Army, #8052.  The Alaska Railroad purchased and rebuilt it in 1950.  It was retired and scrapped in 1973.
Two of the four remaining Alaska RR Alco RS-1’s with cabs were reactivated in August 1971 to relieve a power shortage. Built in February 1943 for the US Army for service in Iran, the ARR purchased the engines and had the shroud applied in 1949.
In this photograph, number 1072 is stopped at the Curry Hotel (at right). 1950

Photographer courtesy of Albert W. Bailey