File:US&S Model 14 EP machine Baltimore Union Jct.jpg

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English: View of Model 14 electro-pneumatic interlocking machine manufactured by Union Switch & Signal Co. Installed at Union Junction Interlocking Tower, Baltimore, Maryland in 1935 for the Pennsylvania Railroad. The tower was closed in 1987. Cropped photo.
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Library of Congress Prints and Photograph Division, Historic American Engineering Record

This image is available from the United States Library of Congress's Prints and Photographs division
under the digital ID hhh.md0888.
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Author William E. Barrett
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Public domain This image or media file contains material based on a work of a National Park Service employee, created as part of that person's official duties. As a work of the U.S. federal government, such work is in the public domain in the United States. See the NPS website and NPS copyright policy for more information.

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This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code. Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.
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current23:48, 14 May 2011Thumbnail for version as of 23:48, 14 May 20114,720 × 3,688 (4.07 MB)Caseyjonz (talk | contribs)== Summary == {{Information |Description={{en|1=View of Model 14 electro-pneumatic interlocking machine manufactured by Union Switch & Signal Co. Installed at Union Junction Interlocking To

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