Most of the photos on this site were extracted from reference images (high-resolution tiffs, 20 to 200 megabytes in size) from the Library of Congress research archive. (To query the database click here.) Many were digitized by LOC contractors using a Sinar studio back. They are adjusted by your webmaster for contrast and color in Photoshop before being downsized and turned into the jpegs you see here.
Santa Fe 4-8-4 2928 in passenger train helper service over Cajon Pass. Photo taken 10-19-1952. Photographer unknown, unfortunately. View full size.