Alfred Hart 1865-1869 East portal of summit tunnel. Western summit. Length 1,660 feet [Central Pacific Railroad, California. Scenes in the Sierra Nevada Mountains. No. 198]
Stereoview Library of Congress, Prints and Photographs Division Reproduction Number: LC-DIG-stereo-1s00547 (digital file from original photo, front) LC-DIG-stereo-2s00547 (digital file from original photo, back) LC-USZ62-110744 (b&w film copy neg. of full stereo)
