Dispatch: Track defects caused fiery crude-oil derailments that forced 1,100 people from their homes in the Appalachian village of Mount Carbon, West Virginia, this year and killed 47 people in a Canadian town in 2013. In fact, a Dispatch analysis of federal records shows that track defects and human error are to blame for most railway incidents. Yet U.S. regulators continue to focus on tanker cars instead of the rails that support the cars and millions of gallons of Bakken crude, a type of highly...