Investigators look over the damage to an Amtrak engine that hit heavy equipment on the tracks causing a derailment Sunday in Chester, Delaware County.

CHESTER, Pa. — Amtrak said its trains will run as regularly scheduled today as federal officials investigate the deadly derailment outside Philadelphia after a train struck heavy equipment on the tracks.

In travel alerts on its website, Amtrak advised that services would resume on the heavily traveled start of the week, although commuters may encounter delays on Acela Express, Northeast Regional and other services between Philadelphia and Wilmington, Del.

Amtrak referred all other questions about the Sunday crash of Train 89 to the National Transportation Safety Board, which is conducting the investigation.

The train was heading from New York to Savannah, Ga., at about 8 a.m. when it hit a piece of equipment that was on the tracks in Chester, about 15 miles outside of Philadelphia, officials said. The impact derailed the lead engine of the train that was carrying more than 300 passengers and seven crew members. Chester Fire Commissioner Travis Thomas said two people were killed.