Photo of Construction Number 45 showing right side of 36 inch gauge Alan Wood Steel Company 47 ton, Heisler Geared Fireless Steam Locomotive Number 1 at Ivy Rock, Pennsylvania, undated.

Photo of Construction Number 45 showing right side of 36 inch gauge Alan Wood Steel Company 47 ton, Heisler Geared Fireless Steam Locomotive Number 11 at Ivy Rock, Pennsylvania, 1950's.

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

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

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

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.