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signal tower
sig·nal tow·er (plural sig·nal tow·ers)


noun 
Definition:
 
U.S. railroad control point: an electrically and semiautomatically operated control point for a large system of railroad track
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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