Menlo Park to Newark

The Dumbarton Line

Picture Point of Interest

Map submitted by Paul Carr.

Showing of

The old Southern Pacific swing bridge can be seen in the distance, left permanently in the "open" position to allow passage to boat traffic. The concrete structures in the foreground are part of the Hetch Hetchy Aqueduct. Photo by Andrew Laverdiere, February 2009.

This is the only rail line that crosses the San Francisco bay, the middle portion of which was abandoned in 1982. Union Pacific continues to operate the east side of the line, from Newark Junction to the west, to serve industrial customers. Caltrain owns the other side from Redwood Junction to the east, usually using it for storing work train equipment. Caltrain was chosen to operate on the line for future commute service. This project would add four stations to the Caltrain system: Union City, Fremont-Centerville, Newark, and Menlo Park/East Palo Alto. The two swing bridges along the line would have to be replaced. About 33% of the bridge collapsed due to an arson fire in 1998. This project is currently facing financial difficulties with many asking if it is really needed. Construction is scheduled to start in 2009 after a 30-month environmental review, and begin service in 2012.

Thanks to Paul Carr for contributing information about this route.

There was also a swing bridge crossing Mowry Slough. It was moved to the open position in the late 1980s at the request of the US Fish & Wildlife Service. Feral Red Foxes were using this bride to gain access to marshlands and predating the endangered Clapper Rail.

Paul Noble
Edgewood , NM


Would be interesting to run a "fishing train" out to the swing. There would be several who would pay for the service.

Houston, TX


The plan by caltrain to start revenue service over the ROW has been shelved. Monies are now being spent on extending bart to San Jose.

Oakland, CA


I have a short video with the west side of the line at the part with the signals and missing track.

Alexander Howell
California, CA


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Do you have any pictures or information about The Dumbarton Line? Please . You will get credit for anything you contribute.