キー・システム
Silent film: "A Trip to Berkeley" at the American Memory Project, Library of Congress, 1906.
"Key System #182 sitting in the car barn at the Western Railway Museum, Sept. 1990."
A Key System bridge unit in Oakland, 1954.
A gallery of Key System images
Another image gallery
Postcard: Key Route Pier
Images from nysubway.org
Photo: Key System train on Key Mole adjacent to new Bay Bridge, 1936