Amtrak and SEPTA have resumed rail service through the area of Sunday's deadly Amtrak derailment in Delaware County.

The Sunday morning train derailed after crashing into a maintenance vehicle in Chester, killing two rail workers, injuring 37 passengers and shutting down Amtrak and SEPTA trains.

Amtrak, which restored limited service Sunday, said it would operate on its normal schedule Monday, though riders on Acela Express and Northeast Regional trains between Philadelphia and Wilmington may face delays.

The incident, the second fatal Amtrak derailment in the region in the past year, also affected SEPTA's Wilmington/Newark Line, which resumed running Monday morning.

SEPTA said it was running regular weekday inbound service from Delaware on the Regional Rail line, but delays of up to 30 minutes are expected.

After offering modified outbound service during the morning rush hour, SEPTA resumed full outbound service with the 9:23 a.m. train from Jefferson Station making all stops to Wilmington.

Passengers may still experience residual delays while full service resumes, SEPTA said.

Passengers are encouraged to monitor SEPTA's website and the @SEPTA Twitter feed for service updates.

There were 341 passengers and seven crew members on board Amtrak Train 89 when it hit a backhoe on the tracks near Sixth and Booth Streets in Chester at about 7:40 a.m. Sunday. The impact of the crash derailed the train's engine.