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| View Original: | Promenade_St_Tower_Control_Panel.jpg (4580x3579) | |||
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| Keywords: Promenade St Tower Control Panel.jpg interlocking machine control panel inside the Promenade Street Interlocking Tower Providence Rhode Island Tower built 1909 by the New York New Haven and Hartford Railroad The all-relay interlocking machine was built by Union Switch Signal Co and installed in 1946 replacing an earlier electro-mechanical machine Tower later operated by Penn Central and Amtrak; closed in 1986 Cropped photo Library of Congress Prints and Photograph Division Historic American Engineering Record http //www loc gov/pictures/item/RI0376/ http //www loc gov/pictures/item/RI0376/ William E Barrett 1982-1983 RI-23 PD-USGov Promenade St Tower Interlocking machines Union Switch and Signal | ||||
