in the summer and fall of 1927, the 60000 was sent to the southern pacific railroad, which overhauled the locomotive and converted it to an oil burner at its sacramento shops. following its conversion, the 60000 was tested in both freight and passenger service on the sacramento division, during which the engine carried a southern pacific tender. following tests on the sp, the 60000 was sent to the great northern railway between everett, washington and minot, north dakota. overall, the 60000 did not perform as well on oil as it did on coal.