History of The Bay Area Rapid Transit - Automation

Automation

BART was one of the first U.S. systems of any size to have substantial automated operations. The trains are computer-controlled via BART's Operations Control Center (OCC) and headquarters at Lake Merritt and generally arrive with regular punctuality. Train operators are present to make announcements, close doors, and operate the train in case of unforeseen difficulties.

As a first-generation system, BART's automation system was plagued with numerous operational problems during its first years of service. Shortly after revenue service began, an on-board electronics failure caused one two-car test train (with car 143 as the lead car) to run off the end of the elevated track at the Fremont station and into a parking lot. This incident was dubbed the Fremont Flyer, and there were no serious injuries. When revenue service began, "ghost trains" (or false occupancies), trains that show up on the computer system as being in a specific place but don't physically exist, were common, and real trains could at times disappear from the system, as a result of dew on the tracks and too low of a voltage (at 0.6 volts rather than the industry standard 15 volts) being passed through the rails for train detection. Under such circumstances, trains had to be operated manually and were restricted to a speed of 25 mph (40 km/h). Enhancements were made to the train control system to address these "ghost trains" (or false occupancies). However, manual blocking that kept trains in stations until the train ahead had left its station were mandated for several years.

The original signaling technology and subsequent enhancements used to control the trains was developed by Westinghouse.

During this initial shakedown period, there were several episodes where trains had to be manually run and signaled via station agents communicating by telephone. This caused a great outcry in the press and led to a flurry of litigation among Westinghouse, the original controls contractor, and BART, as well as public battles between the state government (advised by University of California professor Dr. Bill Wattenburg), the federal government, and the district, but in time these problems were resolved and BART became a reliable service. Ghost trains apparently still persist on the system to this day and are usually cleared quickly enough to avoid significant delay, but occasionally some can cause an extended backup of manually operated trains in the system. In addition, the fare card system was easily hackable with equipment commonly found in universities, although most of these flaws have been fixed.