Northern Pacific Class Z-3 steam locomotive number 4024 leads a westbound freight train toward Stampede Tunnel at Martin, Washington, circa 1925. Photo by J.A. Turner. Other Subject Classes: steam locomotive, freight train

Northern Pacific Class Z-3 steam locomotive number 4011 leads a westbound freight train near Martin, Washington, circa 1925. Photo by J.A. Turner. Other Subject Classes: steam locomotive, freight train

Northern Pacific Class Z-3 steam locomotive number 4006 leads a westbound freight train near Martin, Washington, in 1924. Photo by J.A. Turner. Other Subject Classes: steam locomotive, freight train

Northern Pacific Class Z-3 steam locomotive number 4005 is the rear helper on a westbound freight train near Martin, Washington, in 1924. Photo by J.A. Turner. Other Subject Classes: steam locomotive, freight train

The rear helper engine on an extra freight west between Easton and Martin, Washington, circa 1917. Photo by Ralph Parsons, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, freight train, snow and ice.

A train crew member walks the top of a train between Easton and Martin, Washington, circa 1917. Note helper locomotive pushing behind the caboose. Photo by Ralph Parsons, J.M. Fredrickson collection. Other Subject Classes: freight train, steam locomotive, railroad crew.

A class Z-3 locomotive enters the cut at Tunnel 2, east of Martin, Washington, circa 1917. J.M. Fredrickson collection. Other Subject Classes: steam locomotive, freight train.

Northern Pacific steam locomotive 500 poses with crew, circa 1890. Number 500 (old number series) is a class M built by Baldwin in 1886 for service on the Stampede Pass switchbacks. Renumbered to No. 1. in 1897. J.M. Fredrickson collection. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 4018 awaits its next train at Martin, Washington, in 1944. Number 4018 is a class Z-3 built by Alco-Brooks in 1917. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive in roster photo

Northern Pacific steam locomotive 4015 at Martin, Washington, in July 1944. Number 4015 is a class Z-3 built by Alco-Brooks in 1917. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive in roster photo