Sixteen years after ATO (automatic train operation) was suspended on the Washington Metro following a fatal rear-end collision on the Red Line, the Washington Metropolitan Area Transit Authority (WMATA) has restored operator-assisted ATO to the entire system. Metrorail, one of the first modern rapid transit systems in the U.S. when it opened in 1976, is now “operating as designed.”
Systemwide ATO comes six months after the Red Line returned to ATO on Dec. 15, 2024 2024. WMATA cut over the Blue, Orange and Silver Lines on June 15. The Yellow and Green Lines returned to ATO on May 23. ATO, the authority said, “is not used during inclement weather, single-tracking, and when workers are on the tracks.” It comes with “rigorous internal training and testing and concurrence from the Washington Metrorail Safety Commission.”
The fatal 2009 accident, which killed nine including the operator of the following train, occurred because of a “loss of train detection in the ATC (automatic train control) system, according to the National Transportation Safety Board Railroad Accident Report (download below). ATC, with ATP (automatic train protection) and ATS (automatic train supervision), are ATO’s three subsystems. “At the time of this accident, the ATC system was reporting [a track circuit] as vacant (unoccupied) even while it was occupied by train 214 (ref. p. 83),” NTSB explained. “Based on that report, the system transmitted speed commands of 55 mph to train 112, which caused the train to automatically start and begin to accelerate to that speed. The ATC system transmitted speed commands of 55 mph to train 112 even as the train struck the rear of train 214.”
Since the December 2024 Red Line implementation, “there have been no safety issues or red (stop) signal violations for trains operating in ATO,” WMATA said. “Along with the return to ATO, Metrorail is also returning to the original speed of the system, up to 75 mph. Several outer portions of the Blue, Orange and Silver Lines will see speed increases from 55 mph to 65 or 75 mph in some stretches. Starting June 22, Metrorail will reduce end-to-end travel times by about 3 minutes on all three lines. The Yellow and Green Lines … will also see decreased travel times of 1-2 minutes. Based on analysis of several months of successful ATO operation in passenger service, end-to-end Red Line travel times have been reduced by a total of 8 minutes. WMATA is continuously monitoring the performance of ATO, and additional time savings on the Blue, Orange, Silver, Yellow and Green Lines may be incorporated later this year.”
“This is a major milestone for Metrorail, and it has been a long time coming. I want to thank the team for their dedication and commitment to making this happen,” said WMATA General Manager and CEO Randy Clarke. “This is a win for customers and staff who will experience safer, more reliable rides. Meanwhile, Metrorail is saving money as ATO is more cost efficient.”
