File:GRS Model 2 Interlocking machine.jpg

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Description
English: View of GRS Model 2 unit lever type interlocking machine, in combination with operating switchboard and indicator groups.
Date (reprinted 1915)
Source "Electric Interlocking Handbook." p. 52.
Author Henry M. Sperry, Editor. General Railway Signal Co., Rochester, New York, USA

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This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.
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United States
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current23:22, 23 August 2011Thumbnail for version as of 23:22, 23 August 2011870 × 600 (391 KB)Caseyjonz (talk | contribs)== Summary == {{Information |Description={{en|1=View of Model 2 unit lever type interlocking machine, in combination with operating switchboard and indicator groups.}} |Source= [http://books.google.com/books?id=ZPINAA

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