Builder photo of Construction Number 1376 showing right side of Altoona Northern Railroad 85 Ton, Three Truck Heisler Geared Steam Locomotive Number 106 at Erie, Pennsylvania, May 1918. This locomotive was used primarily for hauling coal near Altoona, Pennsylvania.

Builder photo of Construction Number 1356 showing right side of Altoona Northern Railroad 53 Ton Two Truck Heisler Geared Steam Locomotive Number 104 at Erie, Pennsylvania, March 1917. This locomotive was used primarily for hauling coal near Altoona, Pennsylvania.

Almanor Railroad Shay number 4, a three truck steam locomotive parked at an unknown logging facility circa 1950. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, geared locomotive.

Almanor Railroad steam locomotive number 104, a three-truck Heisler, in storage at Tacoma, Washington, circa 1950. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, geared locomotive.

Almanor Railroad steam locomotive number 104, a three-truck Heisler, in storage at Tacoma, Washington, circa 1950. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, geared locomotive

Alberta Prairie Railway steam locomotive 41 on display at Big Valley, Alberta on July 19, 1990. Alberta Prairie 41, a 2-8-0 class steam locomotive, was built by Baldwin Locomotive Works. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive

Alberta Prairie Railway steam locomotive 41 on display at Big Valley, Alberta on July 19, 1990. Alberta Prairie 41, a 2-8-0 class steam locomotive, was built by Baldwin Locomotive Works. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive

A builder's photo of Alaska Railroad steam locomotive 901 at Philadelphia, Pennsylvania in September 1976. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive

Alaska Railroad steam locomotive 301, circa 1945. Alaska RR 301 takes water, circa 1945. Number 301 is formerly Northern Pacific number 1042 class L-9, 0-6-0, built by Alco-Manchester, 1906 was sold by the Northern Pacific in 1942. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster shot

Alaska Railroad steam locomotive 301, circa 1945. Alaska RR 301 takes water, circa 1945. Number 301 is formerly Northern Pacific number 1042 class L-9, 0-6-0, built by Alco-Manchester, 1906 was sold by the Northern Pacific in 1942. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster shot