In 1975 you could still get to Port Chicago, CA and drive on Port Chicago highway. It was very close to where I lived, in Concord. Often I would do a circuit starting in Port Chicago, heading west through Avon to Martinez, CA; then back home.
Photo One: In 1975 ATSF GP35 3326 is all decked out in pinstripes at Port Chicago.
Photo Two: In 1975 the 65-00547 a Navy MRS1 is flying over Port Chicago Highway and SP's Mococo line, just west of Port Chicago.
Photo Three: In 1975 Cal P action; SP 9301 an SD45T-2 leads a mixed set of EMD and Alco power off the Benicia Bridge at Martinez, CA.
Hope you enjoy the photos. I will try to have more soon. As always, your comments, corrections and more information is greatly appreciated!
~Steve Sloan