Authorities say an Amtrak train struck a piece of construction equipment just south of Philadelphia, and some injuries are being reported.
Service on the Northeast Corridor between New York and Philadelphia has been suspended.
Amtrak said Train 89 was heading from New York to Savannah, Georgia, when it struck a backhoe that was on the track in Chester, about 15 miles outside of Philadelphia.
The impact derailed the lead engine of the train. About 341 passengers and seven crew members were on board.
Amtrak said initial reports are that some passengers were being treated for injuries.
Local emergency responders are on the scene and the crash is being investigated.
After disrupted service Sunday morning, Amtrack will operate Monday with residual delays between Philadelphia and Wilmington.
Acela Express, Northeast Regional and other Amtrak services will be subject to some delays in the affected area between Philadelphia and Wilmington. Keystone Service between New York and Harrisburg will also operate as scheduled.
Passengers with travel plans can confirm their train's status, change their plans or review refund information using a range of tools - including Amtrak.com, smartphone apps or by calling 800-USA-RAIL. Service Alerts, Passenger Notices and other announcements are posted at Amtrak.com/alerts.
Amtrak will operate regularly scheduled trains on Monday along the NEC with some delays btwn Philly/Wilmington https://t.co/0oilXAZsFc.
— Amtrak (@Amtrak) April 3, 2016