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On the sign:
NEW YORK CENTRAL RAILROAD 69th ST. TRANSFER BRIDGE HAS BEEN PLACED ON THE NATIONAL REGISTER OF HISTORIC PLACES BY THE UNITED STATES DEPARTMENT OF THE INTERIOR
The bridge is part of the western line of the New York Central Railroad, which operated in the northeastern United States. The site served as a transfer platform where vehicles on the train were transferred to ferries that crossed the Hudson River. The platform was built in 1911