[1] It was renumbered to 18 and worked the rest of its career on SP's narrow-gauge lines along with sister locomotives Nos.

In 1954, a new narrow-gauge General Electric diesel locomotive was purchased as Southern Pacific No.

18 was restored for operating condition on a short stretch of track in a public park in Independence, California.

18 was leased to the Durango and Silverton Narrow Gauge Railroad (D&SNG) in Durango, Colorado, to train the crew on an oil burning steam locomotive, as the D&SNG is restoring K-37 No.

On April 9, 2019, while the locomotive was pulling an excursion, a piston ring broke on the engineer's side, creating a hole in the right-side cylinder head.

18 has been used for many double header runs to Silverton since early May 2021 and will be taking part in a photo charter in September 2021 alongside the newly restored No.

18 visited the Nevada State Railroad Museum in Carson City, Nevada, for the Great Western Steam Up event, which marked the 150th anniversary of the completion of the Virginia & Truckee Railroad.