FILE- In this Aug. 2, 2017, file aerial image made from a video provided by WPXI, smoke rises in the air after dozens of cars of a freight train carrying hazardous materials derailed in Hyndman, Pa. Federal investigators say crews encountered air brake problems before a freight train derailed in Pennsylvania earlier this month, causing hazardous material to ignite and forcing residents from their homes. The National Transportation Safety Board's preliminary report issued Monday says a crew stopped the CSX Transportation train before the wreck, applied 58 hand brakes and recharged the air brakes. (WPXI via AP, File)
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