/ Dictionary / Index R rail detector car: Meaning and Definition of Find definitions for: rail' detec"tor car" Pronunciation: [key] — Railroads. Railroads. a car equipped with special instruments and used to locate defects in rails. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. railbird rail fence Related Content Daily Word Quiz: censure Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language