The safety of tank cars in flammable liquids service is constantly improving.
Tank Car Fleet
FLEET DATA SHOWS PROGRESS TOWARD FAST ACT DEADLINES
The tank car fleet in North America is constantly changing. New cars are constantly being built and introduced into service. Older cars are retired. And many cars are modified or parked temporarily until they are needed.
NEW STANDARD CARS ARE BEING ADDED TO THE FLEET
Monthly production of new standard DOT-117J cars and DOT-120J200 cars began in 2014, even before the new regulation was passed in May of 2015, and before the FAST Act was signed in December 2015. These new cars are helping to replace legacy DPT-111s, and meet demand for growth in Ethanol and Other Flammable Liquid service.
Fleet Data Archive
FREQUENT UPDATES SHOW PROGRESS TO MEET FAST ACT DEADLINES
Data provided by the Association of American Railroads and the Railway Supply Institute Committee on Tank Cars (RSICTC) members shows DOT-111 in crude oil service are being phased out and new DOT-117 are quickly becoming a larger percentage of the fleet in flammable liquid service. The industry is committed to meeting all FAST Act deadlines.
Conditional Probability of Release (CPR)
"CONDITIONAL PROBABILITY OF RELEASE" IS A MEASURE FOR PROBABILITY OF A SPILL UNDER CERTAIN ACCIDENT CONDITIONS
Tank car builders and engineers use a variety of methods to measure the performance of various tank car technologies like head shields and tank jackets. Because no two accidents are ever alike, the science behind these measurements is based on statistics and probability. The numbers shown here provide the best possible understanding of how tank cars in certain configurations are likely to perform based on actual, historic accident data from the RSI – AAR Safety Research & Test Project Tank Car Accident Database.
While tank cars have demonstrated a good ability to withstand damage, it is impossible to reduce the risk of a spill to zero. The probability of product release in a derailment for a legacy non-jacketed, DOT-111 is 0.196, or 19.6 percent–if it is derailed in an FRA-reportable accident. The new FAST Act compliant, DOT-117 specification tank cars, which feature an array of safety features, significantly reduces that probability of a spill by as much as 85 percent, to just 2.9 percent.
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Performance of the Tank Car Fleet
THE AVERAGE CPR OF THE TANK CAR FLEET IN SERVICE IS IMPROVING DRAMATICALLY
Between 2013 and 2016, the relative Conditional Probability of Release (CPR) for the fleet of tank cars in flammable liquids service has been reduced by 60 to 85 percent, compared to the DOT-111 legacy fleet. These figures are based on data from FRA-reportable accidents involving spills greater than 100 gallons for various standards of tank cars including those in the CPC-1232 and DOT-117 equivalent standards.
Flip through some charts below to see the overall fleet CPR and the CPR for the tank car fleet in flammable liquids of service.