The engine was design to work for logging duties for the J. Neils Lumber Co.
The engine was later transported to the rainy river lumber co.
It used to work in the woods and mines until the arrival of log trucks and cats in the 1920s and the 1930s.
Today it's under a rebuild at the Libby Heritage Museum.
No. 4 got the honors to haul cattle cars full of elks across the Kootenai River.
No. 4 was another shay the used work for the J. Neils Lumber Co. alongside with No. 5.