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.
"New York - New Jersey Tunnel." One of two pairs of Hudson & Manhattan Railroad tunnels under the Hudson River sometime around their opening in 1908, after more than 30 years of off-and-on construction. A century later, the system operates the PATH trains between New Jersey and New York. View full size. 8x10 glass negative, George Grantham Bain Collection. (History of the tubes.)