mine radio telephone system

mine radio telephone system

[′mīn ¦rād·ē·ō ′tel·ə‚fōn ‚sis·təm]
(mining engineering)
A communication system between the dispatcher and locomotive operators; radio impulses travel along the trolley wire and down the trolley pole to the radio telephone.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.