Automatic train control and communications for Washington Metro

Outlines the structure of the train control system comprising of three subsystems: automatic train protection; automatic train operation and automatic train supervision including automatic car identification. The computer complex employs both a primary control computer and a backup computer. Additional communication facilities include: the backbone cable transmission system; the mobile radio system; the telephone service with an electronic PABX; the public address system and the closed circuit television system; train control alarms; and a fire and intrusion system etc.