
This image is a crop of a photograph by Jack Delano, who was employed by the United States Farm Security Administration - Office of War Information. The original image is in the Library of Congress, Prints & Photographs Division, FSA-OWI Collection, call number LC-DIG-fsac-1a34816 DLC. The library asserts on its copyrights page:
Photographs in this collection were taken by photographers working for the U.S. Government. Generally speaking, works created by U.S. Government employees are not eligible for copyright protection in the United States. However, they may be under copyright in some foreign countries and privacy and publicity rights may apply.
This and an enormous number of other railroad photos can be viewed on the Library of Congress's American Memory website.