/ Dictionary / Index R rack locomotive: Meaning and Definition of Find definitions for: rack' locomo"tive Pronunciation: [key] a locomotive designed for operation on a rack railway. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rackle rack rail Related Content Daily Word Quiz: modify Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language