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Meaning of rail rapid transit

rail' rap'id tran'sit

Pronunciation: [key]
  1. a system of rail transit within an urban area that has exclusive right of way either below, above, or on the ground and so is capable of relatively high operating speed. Abbr.: RRT Cf.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.