Anderson, only identified as a teenage girl at the time, was pronounced dead at the scene by medics, Burke said.
She was the teen who was reported missing from the Franklin area earlier Tuesday, Carlisle Police Chief Mike Bruck said.
Bruck said he has spoken with Carlisle Superintendent Larry Hook and investigators are following up with the railroad.
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“We think it was a tragic accident,” Bruck said.
Burke added it’s not unusual to see both kids and adults cross the train tracks in the area where the teen was hit.
“(It’s) impossible to determine from the injuries whether this was suicide or accident. But the medical exam may glean some more information in that direction,” he said.