What year did the Southern Pacific class AC-9 begin running between Alturas, CA and Nevada's fifth most populous city?
Southern Pacific class AC-9:  In 1952, they were converted to burn oil instead of coal, and moved to Southern Pacific's Modoc line between Sparks, Nevada, and Alturas, California, where they worked in freight service from 1953 until retirement in 1956. Sparks, Nevada:  It is the fifth most populous city in Nevada.
1952