Built by Samhongsa in South Korea, this Union Pacific prototype was among the last brass models imported by Alco Models.
This 1982 HO-scale release represents a rebuilding program undertaken by UP in the late 1970s to recycle its SW7, SW9, and
TR5 switchers. Diesel Era covers the program's history and documents the output of 75 examples of SW10s produced from
1979 to 1984 in its Volume 6, Number 3 edition from May/June 1995.