City of Portland Steam Locomotive Number 6 with freight train, at Prineville, Oregon, 1949.

Cincinnati & Southern 2-6-0 steam locomotive number 29 (the Chatanooga Choo-Choo) on display at the depot in Chattanooga, Tennessee, in July 1978. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, display

Cincinnati & Southern 2-6-0 steam locomotive number 29 (the Chattanooga Choo-Choo) on display at the depot in Chattanooga, Tennessee, in July 1978. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, display

Builders photo of Construction Number 1565 showing right side of Cia Maderera de Durango (Durango Lumber Company) 80 Ton Three Truck Heisler Geared Steam Locomotive Number 4 at Erie, Pennsylvania, August 1928. This locomotive was used for logging near El Salto, Mexico. Photograph by Schauble.

Chief Crazy Horse Railroad number 9, a 2-6-0 steam locomotive, on static display in South Dakota on September 1, 1972. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, display.

Chicago, Burlington and Quincy Railroad  steam locomotive 719, a 4-6-0 locomotive, on display at Alliance, Nebraska, on September 01, 1972. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive

Chicago, Burlington and Quincy Railroad  steam locomotive 719, a 4-6-0 locomotive, on display at Alliance, Nebraska, on September 01, 1972. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive

Chicago, Burlington and Quincy Railroad  steam locomotive 3006, a 4-6-4 class locomotive, on display at Galesburg, Illinois, on August 29, 1972. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive

Chicago, Burlington and Quincy Railroad  steam locomotive 3006, a 4-6-4 class locomotive, on display at Galesburg, Illinois, on August 29, 1972. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive