Northern Pacific Class C-1 #684 is an American type (4-4-0) locomotive built by the New York Locomotive Works in Rome, NY, in 1883. Given the shop number #39, on 10th September 1883, two days after the Northern Pacific
Railroad was completed, the engine arrived at St Paul and was renumbered NP #684. It was one of twenty-four of this type bought by the railroad that year (#338-#349 &
#680-#691).
The engine wheelbase is 23’ 4” and driver wheelbase 8’ 6”. The engine weighs 90,500 lbs, 59,250 lbs on its 62” drivers. With 17 sq ft grate, Stephenson valve gear, 17” x 24” cylinders and operating at a boiler pressure of 140 psi, it delivered 13,313 lbs tractive effort.
The engine worked mostly on the Northern Pacific’s main line in Montana and Idaho. It remained in main line passenger service for nearly twenty-five years and was then assigned to the Billings-Bridger passenger run. It was then sent further east to less mountainous terrain where it occasionally served tourist areas as a glamorous “old timer” of the early steam era. By the late 1920s, the Northern Pacific had no need for the out of date steam engine and retired it from duty.