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Interborough rapid transit: the New York subway, its construction and equipment
Rare Book Division, The New York Public Library. "Rear view of block signal post, showing transformer and instrument cases with doors open." The New York Public Library Digital Collections. 1904. https://old-digitalcollections.nypl.org/items/510d47dc-9bb4-a3d9-e040-e00a18064a99
Rare Book Division, The New York Public Library. "Rear view of block signal post, showing transformer and instrument cases with doors open." New York Public Library Digital Collections. Accessed October 1, 2026. https://old-digitalcollections.nypl.org/items/510d47dc-9bb4-a3d9-e040-e00a18064a99
Rare Book Division, The New York Public Library. (1904). Rear view of block signal post, showing transformer and instrument cases with doors open. Retrieved from https://old-digitalcollections.nypl.org/items/510d47dc-9bb4-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://old-digitalcollections.nypl.org/items/510d47dc-9bb4-a3d9-e040-e00a18064a99 | title=
(still image)
Rear view of block signal post, showing transformer and instrument cases with doors open., (1904)
|author=Digital Collections, The New York Public Library |accessdate=October 1, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>