The Denver & Rio Grande Western acquired ten class L-105 4-6-6-4s from Baldwin Locomotive Works in 1938. Their four cylinders measured 23x32 inches, their driver diameter was 70 inches, and they sustained 280 p.s.i. of boiler pressure. They exerted a tractive effort of 104,833 pounds and weighed 641,000 pounds. Grate area totaled 136½ square feet, while evaporative heating surface was 6341 square feet and superheating surface 2628 square feet. These locomotives featured a single cast-steel engine bed and a silicon manganese steel boiler. No. 3702 represented the class in this Baldwin builder's photo; all saw retirement by 1956.