	Introduction

The dramatic increase in U.S. and Canadian crude oil production in recent years, coupled with the increase in crude oil transport by rail, has raised questions about whether properties (e.g., flammability) of these crude types—particularly Bakken crude oil from North Dakota and Canada's oil sands—differ sufficiently from other crude oils to warrant any additional handling considerations. The U.S. PHMSA has issued a Safety Alert to notify emergency responders, shippers, carriers, and the public that recent derailments and resulting fires indicate that the type of crude oil transported from the Bakken region of North Dakota may be more flammable than traditional heavy crude oil. The PHMSA alert reminds emergency responders that light sweet crude oil, such as that coming from the Bakken region, poses significant fire risk if released from the package (tank car) in an incident. All crude oils are flammable, to a varying degree. Further, crude oils exhibit other potentially hazardous characteristics as well. The growing perception is that light volatile crude oil, like Bakken crude, is a root cause for catastrophic incidents and thus may be too hazardous to ship by rail. However, equally hazardous and flammable liquids from other sources are routinely transported by rail, tanker truck, barge, and pipeline, though not without incident. A key question for Congress is whether the characteristics of Bakken crude oil make it particularly hazardous. Conversely, does focusing so much attention on the commodity distract from other causes of transport incidents, such as maintenance practices, safety standards and human error?
The dramatic increase in U.S. crude oil production, coupled with the increase in crude oil transport by rail, has raised questions about whether properties (e.g., flammability) of these crude types—particularly Bakken crude oil from North Dakota—differ sufficiently from other crude oils to warrant any additional handling considerations. The U.S. Pipeline and Hazardous Materials Safety Administration (PHMSA) issued a Safety Alert to notify emergency responders, shippers, carriers, and the public that recent derailments and resulting fires indicate that the type of crude oil transported from the Bakken region of North Dakota may be more flammable than traditional heavy crude oil. The alert reminds emergency responders that light sweet crude oil, such as that coming from the Bakken region, pose significant fire risk if released from the package (tank car) in an accident. PHMSA has expanded the scope of lab testing to include other factors that affect proper characterization and classification of crude oil such as volatility, corrosivity, hydrogen sulfide content and composition/concentration of the entrained gases in the material.
All crude oils are flammable, to a varying degree. Further, crude oils exhibit other potentially hazardous characteristics as well. The growing perception is that light volatile crude oil, like Bakken crude, is a root cause for catastrophic incidents and thus may be too hazardous to ship by rail. However, equally hazardous and flammable liquids from other sources are routinely transported by rail, tanker truck, barge, and pipeline, though not without accident.
A key question for Congress is whether the characteristics of Bakken crude oil make it particularly hazardous to ship by rail, or are there other causes of transport incidents, such as poor maintenance practices, inadequate safety standards, or human error.