Crude oil is an indispensable ingredient in numerous products, and railroads play a crucial role in the nation’s crude oil logistics. With their extensive network and adaptability, railroads ensure a steady supply of crude oil for various industries, from transportation fuels to medicine. The industry’s commitment to safety standards has led to a strong track record, with over 99.9% of hazmat, including crude oil, reaching its destination safely.


  • More than 99.9% of hazmat moved by rail, including crude oil, reaches its destination without incident.
  • The hazmat accident rate is down 73% since 2000.
  • One rail car carries enough crude oil to make about 13,500 gallons of gasoline
  • In 2022, the average carload of crude oil originated in the United States carried around 650 barrels of oil.

Everything from transportation fuels and plastics to polar fleece jackets, toiletries and medicines is made from crude oil. Since this important commodity is a hazardous material, the freight rail industry continually evaluates and modernizes its hazmat operations to ensure its safe movement. Railroads rigorously train their employees on how to safely handle hazmat, as well as train tens of thousands of first responders each year.

Railroads also leverage today’s innovative technologies to increase hazmat safety, including developing software that analyzes safe and secure rail routes and wayside sensors that increase and improve track inspections. The rail industry has long advocated for more robust tank car standards, endorsing a federal government ruling that today’s tank cars are built with higher-grade steel, better thermal protection, improved valves and fittings and thicker tanks.

U.S. Crude Oil Production

The “shale revolution” created more U.S. crude oil production. U.S. crude oil production in 1970 averaged 9.6 million barrels per day. By 2008, it had fallen to just five million barrels per day as new fields failed to keep pace with the depletion of older fields.

However, thanks mainly to growth in shale oil, U.S. crude oil production grew to 12.3 million barrels per day in 2019 before falling to 11.3 million in 2020. Texas and North Dakota have accounted for most of the U.S. crude oil output increase in recent years. Production also rose sharply in New Mexico, Oklahoma and Colorado.

Rail Shipments of Crude Oil

Historically, pipelines have transported most crude oil. However, higher crude oil production outpaced growth in pipeline capacity, especially in North Dakota. Railroads helped fill this gap. Originated carloads of crude oil on U.S. Class I railroads surged from 9,500 in 2008 to 493,146 in 2014.

As new pipelines were built, they fell sharply over the next few years, but carloads rebounded somewhat in 2018 and 2019. Terminated carloads of crude oil on U.S. Class I railroads rose from 9,344 in 2008 to a peak of 540,383 in 2014 before falling sharply and then rising again, in part because of large volumes of crude oil originated in Canada and shipped by rail to refineries in the United States. (1).

At its peak in 2014, crude oil accounted for 1.6% of originated carloads and 1.7% of total terminated carloads. In 2021, crude oil’s share was down to 0.3% for originations and 0.6% for terminations. The amount of crude oil in a rail carload varies depending on (among other things) the source of the oil, the type of tank car used, and the year’s season. In 2014, the peak year for rail crude oil shipments, railroads accounted for around 11% of U.S. crude oil production.

[1] “Originated” carloads are loaded carloads beginning a rail journey; “terminated” carloads are loaded carloads completing a rail journey. U.S. Class I originations do not equal U.S. Class I terminations because some crude oil that originates on U.S. Class I railroads is terminated by U.S. short line railroads or railroads in Canada. Likewise, some crude oil that terminates on U.S. Class I railroads originates on railroads in Canada or on U.S. short line railroads.

Timeline: Hazmat Safety Actions

  • AUG. 2009: AAR begins to upgrade industry tank car standards that exceed the safety standards of U.S. Department of Transportation (DOT)-111 tank cars.
  • MAR. 2011: AAR formally petitions the Pipeline and Hazardous Materials Safety Administration (PHMSA) and Transport Canada to implement tougher tank car specifications for DOT-111 tank cars used for crude oil and other hazmat.
  • AUG. 2011: In the absence of any progress by the DOT and Transport Canada, the AAR Tank Car Committee adopts industry construction specifications for new tank cars, and the stronger CPC-1232 design becomes the standard for all tank cars built after October 2011.
  • AUG. 2013: The freight rail industry responds to DOT Emergency Order No. 28 and Safety Advisory to further strengthen train operations on mainline tracks or sidings. AAR modifies industry best practices, making trains carrying 20 or more carloads of any hazmat subject to a speed restriction and other enhanced operating practices.
  • NOV. 2013: AAR again urges DOT to improve federal tank car regulations and require all tank cars transporting flammable liquids, such as crude oil, to be retrofitted or phased out of crude service.
  • FEB. 2014: The nation’s major freight railroads issue voluntary safety initiatives for the transportation of CBR, including new operating practices, including (1) Speed reductions for trains transporting crude oil, (2) Increased inspections of tracks on crude oil routes, (3) Route risk analysis for trains carrying more than 20 carloads of crude oil (a Key Crude Oil Train), (4) Two-way end of train devices or distributed power for Key Crude Oil Trains to provide faster braking, (5) Additional bearing defect detectors along routes carrying Key Crude Oil Trains, (6) Development of an emergency response inventory along routes carrying Key Crude Oil Trains, and (7) Stepped-up crude oil incident training for first responders. / DOT issues an Emergency Order on the classification and packaging of crude oil.
  • MAY 2014: AAR forms a joint task force with the American Petroleum Institute (API) to examine components associated with moving CBR. / PHMSA and the Federal Railroad Association (FRA) issue a Safety Advisory discouraging the use of DOT-111 tank cars. DOT issues an Emergency Order requiring railroads to inform first responders about crude oil routes.
  • JUL. 2014: AAR provides DOT with access to an inventory of emergency response resources available to respond to hazmat accidents. / DOT issues a Notice of Proposed Rulemaking (NPRM) on tank car standards and an Advanced NPRM on oil spill response planning requirements. / A three-day training course for first responders focused exclusively on CBR occurs at the Security and Emergency Response Training Center (SERTC) (an AAR subsidiary) in Pueblo, Colorado. More than 1,500 emergency responders receive classroom and in-field training in 2014 at the world-class facility.
  • SEP. 2014: In comments to DOT’s proposed rules for regulating crude oil trains, AAR again calls for dramatically improved tank cars that carry crude oil and ethanol and proposes a comprehensive safety package, which includes thicker shells, thermal protection and appropriately-sized pressure relief devices. AAR advocates an aggressive retrofit or phase-out program for crude service tank cars.
  • OCT. 2014: Roll-out begins of the rail industry-developed AskRail mobile app, which is an additional tool for emergency responders to access information about hazardous materials contained in rail cars when responding to an incident.
  • NOV. 2014: SERTC launches web-based crude oil training for first responders.
  • JAN. 2015: AAR further modifies industry best practices to increase commodity flow information provided to local emergency response agencies for all hazmat transported through their communities.
  • MAR. 2015: AAR and API announce a new CBR safety course for first responders. The program, offered through the Transportation Community Awareness and Emergency Response (TRANSCAER) program, is in addition to specialized training offered to thousands of first responders by railroads in local communities at SERTC and through web-based training. AAR enhances the AskRail app.
  • APR. 2015: PHMSA issues a Safety Advisory on emergency response information; FRA issues an Emergency Order on maximum speeds for CBR moving through certain highly populated areas; and FRA issues a Safety Advisory on brake and mechanical inspections for trains moving crude.
  • MAY 2015: DOT issues a comprehensive final rule on tank car standards and operations for moving large volumes of flammable liquids by rail. / PHMSA issues Transportation Rail Incident Preparedness and Response (TRIPR) training modules on best practices related to rail incidents involving flammable liquids.
  • JUL. 2015: FRA further specifies requirements for railroad notifications to State Emergency Response Commissions concerning crude oil.
  • SEP. 2015: DOT announces $5.9 million in first responder grants specific to crude oil incidents.
  • DEC. 2015: Congress passes the FAST Act, which includes numerous provisions supported by the freight railroad industry related to rail safety generally, emergency response training and the safe transport of flammable liquids by rail. Among these are requirements for web-based training for emergency responders, emergency preparedness and training grants, specifications for real-time emergency response information, enhanced tank car standards and a mandatory phase-out schedule for older tank cars.
  • FEB. 2016: The proposed rule on oil spill planning and information sharing for crude oil trains is revised based on FAST Act requirements and sent to the Office of Management and Budget (OMB) for review.
  • MAY 2016: AAR urges DOT to adopt a thermal protection requirement for flammable liquid cars, which exceeds DOT’s current standard and which all thermal blanket manufacturers currently meet. The new standard would increase the amount of time flammable liquids could survive a pool fire and reduce the chance of thermal tears.
  • JUL. 2016: DOT rejects AAR’s request to improve the standard for thermal protection based on a technicality.
  • AUG. 2016:  DOT issues a rule requiring thermal protection blankets per the FAST Act, but not requiring that they be as effective as the AAR had requested or manufacturers currently make.
  • SEPT. 2016: AAR files comments to DOT’s NPRM on oil spill response plans seeking clarification on a variety of issues, including how close to navigable waters does a rail line have to be to require a plan and the definition of environmentally sensitive areas, among others.
  • DEC. 2016: AskRail upgrades to allow access from any internet-ready device and provides additional information within the app, including DOT car types, the maximum capacity of the locomotive fuel tank and AAR’s Field Guide to Tank Cars.
  • APR. 2017: AAR files comments to DOT’s advanced NPRM on real-time train consist information asking DOT to accept AskRail as the solution. AskRail provides emergency responders with information about what is in the entire train consist by entering one car or locomotive number.
  • DEC. 2017: AskRail upgrades to allow a search by container number, GIS/Mapping including points of interest such as schools and hospitals, street-level views and part of the Emergency Response Guidebook.

Infographic: Tougher Tank Car Standards

Infographic: Transporting Crude Oil