Watch: Investigators try to determine cause of Pa. train derailment

David C. Lester

A train derailment in Marysville, Perry County, Pa., was still on display on Friday as investigators work to find out exactly what happened.

Crews and the Norfolk Southern police were looking into a cause. The accident happened on the Rockville Bridge, which spans the Susquehanna River. Railcars can be seen lying sideways on an embankment. The Roberts Valley Road has been closed while the investigation takes place.

Take a look at investigators combing the scene:

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