an overhaul in the distant future. 480 series The 480 series, or "K-36" class "Mikado" type locomotives, were ten engines designed for the D&RGW. They were built by the Baldwin Locomotive Works in 1925. The 480s were the last ten narrow-gauge locomotives constructed for the D&RGW. The 480s were used for freight-hauling throughout the D&RGW narrow-gauge network. The "36" stands for . of tractive effort. These engines are outside- frame Mikados, and all drive wheels have counterbalancing outside of the frame, resulting in the utilitarian look the engines are known for. The engines currently use 6-ET automatic air and the secondary straight air used on regular service equipment. The railroad runs 12-car passenger trains behind these engines; however more cars require the train to be double-headed. Despite popular belief that the railroad does not doublehead trains out of Durango because of smoke, the real reason is the weight restriction on the bridge at 15th Street, not allowing more than one K-36 at a time (K-28 class engines, however, are still doubleheaded from Durango). The engines were delivered with Master Mechanics-design smokeboxes for draft; however at some point the D&RGW converted them to Andersson (cyclone) front ends. Water is fed to the boiler by two non-lifting injectors. The grate surface in the firebox is among the largest built for a narrow-gauge locomotive and is fed by hand-firing. Firing is simpler on these engines compared to the K-28s; however, the larger surface area requires more fuel. A typical trip uses around on the way up to Silverton and another on the return to Durango. Ergonomically, the engines are less comfortable than the others as well, with the crew seats being farther back from the backhead and the engineer having to lean forward constantly to adjust the throttle and use the sanders. The running gear on the locomotives also tend to wear out faster than the ALCO-designed K-28s, and the resulting pounding and rough ride can take a toll on the engine crew. The D&SNG owns four K-36s: Nos. 480, 481, 482 and 486, all of which are operational. The Cumbres and Toltec Scenic Railroad (C&TSRR) owns Nos. 483, 484, 487, 488 and 489. Locomotive No. 485, unfortunately, fell into the turntable pit in Salida, Colorado in 1955. It was scrapped for parts thereafter; however, some accessories, running and valve gear were salvaged and used on other locomotives. No. 480 has been converted