| http://www.w3.org/ns/prov#value | - Those that have unusual markings are taken to an NTSB laboratory for testing where scientists can tell whether a piece of rail or wheel has been weakened to the point at which it could cause an accident.In most cases they can determine with confidence whether a piece of equipment was damaged by an accident or before it.The NTSB has enjoyed a solid reputation, in no small part because the pictures
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