File:Cross Section of River Tunnel.jpg

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English: Cross-section of river tunnel of the New York Tunnel Extension of the Pennsylvania Railroad.
Date
Source George Gibbs: The New York Tunnel Extension of the Pennsylvania Railroad. Station construction, road, track, yard equipment, electric traction, and locomotives. Paper No. 1165. Proceedings of the American Society of Civil Engineers. Vol. 69, p. 298. Fig. 9 (October 1910).
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current01:50, 19 March 2020Thumbnail for version as of 01:50, 19 March 2020605 × 603 (90 KB)Pechristener (talk | contribs){{Information |description={{en|Cross-section of river tunnel of the New York Tunnel Extension of the Pennsylvania Railroad.}} |date=1909 |source=George Gibbs: ''The New York Tunnel Extension of the Pennsylvania Railroad. Station construction, road, track, yard equipment, electric traction, and locomotives.'' Paper No. 1165. Proceedings of the American Society of Civil Engineers. Vol. 6, p. 298. Fig. 9 (October 1910). [https://archive.org/details/transactionsofam69amer/page/42 archive.org] |a...

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