Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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railroad crossing the place where one railroad track intersects another, or intersects a road at the same level; grade crossing.
railroad flat an apartment in which the rooms are arranged in a row resembling a line of railroad cars, with no connecting corridor or hallway.
Transcontinental Railroad the U.S. railway completed in 1869 that was the first one to connect cities of the Atlantic coast with those of the Pacific coast. [2 definitions]
underground railroad (often cap.) a secret system set up before the U.S. Civil War to help fugitive slaves to escape to places of safety.