St. Louis–San Francisco 1522 was built in 1926 as part of the third order of 1500-class (aka T-54) "Mountain" type locomotives for the St. Louis-San Francisco Railway. Purchased for $70,000, the locomotive was built to handle heavy passenger and freight services along the Frisco Railway's Eastern and Western Divisions, and had a 200 PSI boiler pressure, 69-inch drivers, 54,085 lbs. of tractive effort, and a top speed of 70 mph.
