UPDATE at 11:06 p.m.: The driver killed in the crash was identified as 69-year-old Judy Kay Peer.
The warning gates were extended with flashing lights and a ringing bell, according to police.
After one train passed, Peer drove around the gate and was hit by another oncoming train.
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One person was killed when the vehicle they were in was hit by a train, Chattanooga police spokesman Rob Simmons confirmed.