Federal investigators said in the documents that a broken train axle found after the derailment might have been prevented if BNSF railroad had inspected it more carefully and found a pre-existing flaw.
While lawmakers and regulators focus on the strength of oil tank cars and volatility of crude oil, officials of the rail inspectors’ union say track flaws and train speed can be significant factors in accidents.
The man-made quakes jolted once stable regions in eight states, including parts of Alabama, Arkansas, Colorado, Kansas, New Mexico, Ohio, Oklahoma and Texas, according to researchers at the U.S. Geological Survey.
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