number 525 was officially bought by the sp&s on november 30, 1925. it was used on the mainline because it was able to haul heavier eastbound trains upgrade out of pasco, washington. over time, as newer locomotives were obtained by the sp&s, number 525 was demoted to local or work service, or used on doubleheaded mainline trains. by late 1942 and early 1943, 525 was assigned to the vancouver, washington, yard as a switch locomotive. number 525 was finally scrapped in 1947.