In January 1988, a train hit a maintenance machine that was repairing the crushed rocks of the rail bed near the Highland Avenue Station in Chester.
VIDEO: Raw footage from 1988 Amtrak crash
Two engines and 10 passenger cars derailed.
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24 people were hurt.
The NTSB determined that an Amtrak tower operator had failed to switch the train to an unoccupied track.
On Sunday morning, Amtrak officials say a train struck a backhoe that was on the tracks and the impact derailed the lead engine of the train.
Two people were killed and dozens were injured.
PHOTOS: Fatal Amtrak train derailment in Delaware County
The NTSB is investigating.
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The Associated Press contributed to this report.