D&SNG No. 478 is a 2-8-2 "Mikado" type narrow gauge steam locomotive built by the American Locomotive Company, also known as ALCO, in 1923. It pulled trains across the Denver & Rio Grande Western Railroad (D&RGW) narrow gauge system until being moved to the Durango & Silverton Narrow Gauge Railroad (D&SNG). 478 now runs excursions at the D&SNG and, as of today, is one of eight operable steam locomotives on the railroad. 478 is one of three K-28 class locomotives still in existence today, the other being Nos. 473 and 476. In 2015, 478 was almost traded to the Cumbres & Toltec Scenic Railroad (C&TS) in Chama, NM in exchange for class K-36 steam locomotive 483, but ultimately, the swap never went through. 478 was later taken out of service in December 2016, and as of today, it is on temporary display in the D&SNG roundhouse museum in Durango, CO awaiting a future overhaul.