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Interborough rapid transit: the New York subway, its construction and equipment
Rare Book Division, The New York Public Library. "Front view of block signal post, showing lights, indicatiors and track stop." The New York Public Library Digital Collections. 1904. https://digitalcollections.nypl.org/items/510d47dc-9bb2-a3d9-e040-e00a18064a99
Rare Book Division, The New York Public Library. "Front view of block signal post, showing lights, indicatiors and track stop." New York Public Library Digital Collections. Accessed May 4, 2024. https://digitalcollections.nypl.org/items/510d47dc-9bb2-a3d9-e040-e00a18064a99
Rare Book Division, The New York Public Library. (1904). Front view of block signal post, showing lights, indicatiors and track stop. Retrieved from https://digitalcollections.nypl.org/items/510d47dc-9bb2-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47dc-9bb2-a3d9-e040-e00a18064a99 | title=
(still image)
Front view of block signal post, showing lights, indicatiors and track stop., (1904)
|author=Digital Collections, The New York Public Library |accessdate=May 4, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>