Key System was the Bay Area’s original BART, and then it vanished. Here’s how to find it. | SF Gate
By Bill Buchanan
The tennis courts on the property of the exclusive Claremont resort on the border between Berkeley and Oakland, which was recently sold to a local real estate investment firm, were once the end of the line for a faded but not forgotten East Bay train system.
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Some residual fragments of the once-lively Key System electric railroad, which interlinked the East Bay with San Francisco, hide in plain sight — such as the escape alcoves inside the Bay Bridge’s Yerba Buena Tunnel. Others are as grand as the Claremont Club & Spa.