The Federal Railroad Administration this week issued a safety advisory pertaining to issues encountered by train crews who experience an unintended brake release while stopped at a signal.
The advisory recommends four steps to address the unintended release of train air brakes.
Safety Advisory 2033-02 was published in the Federal Register.
The advisory was prompted by a June 22 incident during a thunderstorm involving an intermodal train with three locomotives, 47 loaded cars, and six empty cars, totaling 9,204 feet in length and 7,392 tons in weight.
The train had stopped on on a downhill grade of 0.9 to 1.18 percent near the signal governing the train’s movement, set the train’s air brakes at approximately 12 pounds, and fully set the locomotive consist’s independent brakes.
The train sat for three hours and then began rolling toward the signal as it continued to display a stop indication.
The locomotive consist’s independent brakes remained fully applied but due to the grade, tonnage and wet rail could not solely hold the train without the automatic air brakes also being applied.
As that incident unfoled, an opposing train movement was about to enter the interlocking in front of the rolling train.
The crew was able to stop the train, in part by activating the emergency brake valve and the train stopped short of the signal. The crew then, after contacting the dispatcher, set a sufficient number of car handbrakes to hold the train on the grade.
Among the FRA recommendations are train crews should not expect a service rate or emergency brake application to indefinitely maintain application of a train’s air brakes; if a train is stopped with air brakes set, and the train begins moving, the crew should immediately apply the emergency brake and after the train is stopped set a sufficient number of handbrakes to secure the train from further unintended movement before releasing the brakes and recharging the train’s air brake system.
Other recommendations included that each railroad should adopt and implement an air brake procedure that addresses unintended brake releases.; and railroads should have an operating supervisor conduct a face-to-face meeting with each locomotive engineer and conductor to explain and reinforce the contents of this advisory.