National Transportation Safety Board members views damaged rail cars in Casselton, N.D.

Recent accidents involving crude oil being shipped from the Bakken area of North Dakota and Montana are raising eyebrows on Wall Street and have analysts looking at companies that could be exposed to new rules governing oil shipments from the region.

Three major accidents have taken place in a short period of time: Two trains collided in Casselton, N.D., last week; a train in November; and 47 people were killed when an oil-laden, runaway train exploded in Quebec in July.