A total of 105 of these Moguls were put into service by the Southern Pacific beginning in 1899. They were from ALCO, most of them from Cooke and the rest from Schenectady. Starting in 1920, they were rebuilt with a superheater. They were used in mainline service up until the 1940s and as switchers into the 1950s. Preserved today is number 1673, which is in Tucson, Arizona and has been cosmetically restored since 2000.