NORTHBROOK, Ill. -- A federal reports blames heat for a 2012 train derailment in the Chicago area that left two people dead.
The July 4 derailment in Northbrook, Illinois resulted in a collapsed railroad bridge, which fell onto a passing car killing the driver and his wife.
The Federal Railroad Administration report says it was 103 degrees outside and that the Union Pacific track had probably buckled.
The misalignment had been spotted by a Union Pacific worker, who asked for a track supervisor to investigate.
The derailment happened before the track supervisor could get to the scene.
The family of the deceased couple has sued Union Pacific over the derailment.