Definitions for underground railway
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Princeton's WordNet
Underground Railroad, Underground Railway(noun)
secret aid to escaping slaves that was provided by abolitionists in the years before the American Civil War
Wiktionary
underground railway(Noun)
A subway system for the movement of trollies or trains.
Citation
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"underground railway." Definitions.net. STANDS4 LLC, 2013. Web. 25 May 2013. <http://www.definitions.net/definition/underground railway>.

