/ Thesaurus / S Synonyms of signal box Find synonyms for: Noun1. signal box, signal tower, building, edificeusage: a building from which signals are sent to control the movements of railway trainsWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: languid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language