Pics of a cross section of America in the late depression era. There are some railroad pics half way down the page. The detail, contrast and subject matter are excellent, enjoy:
http://extras.denverpost.com/archive/captured.html
Look at the size of this yard! caption: Switchman throwing a switch at Chicago and Northwest Railway Company's Proviso yard. Chicago, Illinois, April 1943. Reproduction from color slide. Photo by Jack Delano. Prints and Photographs Division, Library of Congress
http://extras.denverpost.com/archive/captured.html
Look at the size of this yard! caption: Switchman throwing a switch at Chicago and Northwest Railway Company's Proviso yard. Chicago, Illinois, April 1943. Reproduction from color slide. Photo by Jack Delano. Prints and Photographs Division, Library of Congress