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rolling or will be soon from Texas, Colorado and western Canada.
• "This is all occurring very rapidly, and history teaches that when those things happen, unfortunately, the next thing that is going to occur would be some sort of disaster," said Jim Hall, a transportation consultant and former chairman of the National Transportation Safety Board.
• Rail companies said the industry places a priority on safety and has invested heavily in track upgrades, provided emergency training and taken other measures to guard against accidents. There have been no major oil train derailments from the Bakken, according to federal regulators.
• Union Pacific Railroad CEO Jack Koraleski said hauling oil out of places like North Dakota will be a long-term business for railroads because trains are faster than pipelines, reliable and offer a variety of destinations.
• "The railroads are looking at this as a unique opportunity, a game-changing opportunity for their business," said Jeffery Elliot, a rail expert with the New York-based consulting firm Oliver Wyman.
• BNSF Railway Co., the prime player in the Bakken, has bolstered its oil train capacity to a million barrels a day and expects that figure to increase further. To accommodate the growth, in part, the railroad is sinking $197 million into track upgrades and other improvements in Montana and North Dakota.
• BNSF is also increasing train sizes, from 100 oil cars per train to as many as 118.
• Larger trains are harder to control, and that increases the chances of something going wrong, safety experts said. State and local emergency officials worry about a derailment in a population center or an environmentally sensitive area such as a river crossing.
• Rail accidents occur 34 times more frequently than pipeline ones for every ton of crude or other hazardous material shipped comparable distances, according to a recent study by the Manhattan Institute, a conservative think tank. The Association of American Railroads contends the study was flawed but acknowledges the likelihood of a rail accident is double or triple the chance of a pipeline problem.
• The environmental fears carry an ironic twist: Oil trains are gaining popularity in part because of a shortage of pipeline capacity -- a problem that has been worsened by environmental opposition to such projects as TransCanada's stalled Keystone XL pipeline. That project would carry Bakken and Canadian crude to the Gulf of Mexico.
• Wayde Schafer, a North Dakota spokesman for the Sierra Club, described rail as "the greater of two evils" because trains pass through cities, over waterways and

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