SummaryCaption: "Safety device--At open hearing on Long Island Rail Road safety problems in Federal Court, Frank H. Simon, general manager of the road, left, demonstrates how automatic train-stop trippers planned for Brooklyn branch operate, with help of assistant, Dominick Marciari. Top half is attached to car and linked to brake system. Bottom half is tripper attached to track and designed to set brakes if there is a train in block ahead."
Cite AsBrooklyn Daily Eagle photographs, Brooklyn Public Library, Center for Brooklyn History
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