San Francisco : Architect and Engineer, Inc · leaf 247
separatesteel plate (Figures C); and the steel lever (Figure E) moves in a similardirection. Likewise, the lever (Figure F) moves in the same direction asthe running rails (Figures D). At maximum expansion, the lever-like deviceis practically straightened. The curved rails shown in the picture… … San Francisco-Oakland Bay Bridge electric trainsoperate under the most modern electric interlockingand signal system. Pictured above is the control board installed in theSignal Tower of the East Bay Yards. On the right, forcomparison, is an old-style lever system. Had the mechanical lever system…
Architecture · Building
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