| This ten wheeler, SLSF #712, was built by Alco-Brooks in June of 1906 and served until it disappeared from the roster in 1950. The Frisco Shops superheated the loco in 1917. Specs - serial #39934, 63", 200 psi boiler pressure, 21x28" cylinders, engine weight of 197,900 lb, tractive force of 33,300 lb. Arthur B. Johnson photo |