automanual system

automanual system

[¦ȯd·ō¦man· yə·wəl ′sis·təm]
(civil engineering)
A railroad signal system in which signals are set manually but are activated automatically to return to the danger position by a passing train.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.