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[Editor's note: This story was updated at 11:50 a.m. CDT.]The National Transportation Safety Board (NTSB) earlier this week issued its preliminary report on the Amtrak derailment that occurred March 14 near Cimarron, Kan.
The Los Angeles-to-Chicago train was operating on BNSF Railway Co. track when it derailed, injuring 28 passengers. NTSB investigators found that railroad ties and tracks along this portion of track were out of their normal positions and established the point of derailment 25 feet beyond the location. The forward-facing video from Amtrak's lead locomotive also showed abnormal track immediately before the derailment, NTSB officials said in the report. At the scene, investigators found fresh damage to the north ends of the ties and fresh tire tracks perpendicular to the tracks. In addition, they found a small amount of flaked corn, which is a type of cattle feed.Investigators traced the tire tracks to a feed lot owned by Cimarron Crossing Feeders LLC, where the tread on a 2004 Kenworth International truck matched the tire track impressions at the scene, NTSB officials said. The truck hauls flaked corn and distributes it to feed bins.Additionally, NTSB officials noted that the left and right mounting brackets on the truck's front bumper were broken. The train was traveling at 60 mph — the designated speed for the track — when the emergency brakes were applied, the NTSB determined after reviewing event recorder data. Amtrak and BNSF estimated their damages at more than $1.4 million, NTSB officials said.The NTSB's findings in the report are preliminary and will be "supplemented or corrected during the course of the investigation," agency officials said, noting that a probable cause would be determined at the end of the investigation.