Repair work has slowed up Amtrak service all along the Northeast Corridor.
Amtrak service between Washington D.C. and Philadelphia has been restored, after being suspended for several hours on Wednesday afternoon.
Spokesman Craig Schulz says passengers should expect delays of between one to two hours as crews continue repairing the system and restoring the second track for service.
Rail service had been suspended earlier Wednesday after overhead wires were damaged in northeastern Maryland. The damage meant that Acela Express, Northeast Regional and other services were not operating between the two cities.
MARC service will only be running through Martin State Airport, and shuttles will be provided for riders through Perryville.
Amtrak says paid passengers affected by the suspension can receive a refund or voucher.