Amtrak says it will abide by a series of directives from the Federal Railroad Administration in response to Tuesday's deadly derailment in Philadelphia.
They include immediately expanding the use of a speed restriction system to northbound tracks in Philadelphia. The automatic train control system notifies an engineer when a train is above the speed limit and automatically applies the brakes if the engineer doesn't act to slow the train down. It's already in use on the southbound rails approaching the curve where the derailment occurred.
Investigators are trying to determine why the train hit 106 mph in the minute before reaching the curve, which is a 50 mph zone.
The Federal Railroad Administration has also ordered Amtrak to analyze curves to assess risks on the busy stretch of tracks between Washington and Boston. And Amtrak will have to increase the amount and frequency of signage alerting engineers and conductors of the maximum authorized speed.
Amtrak says its "overarching goal is to provide safe and secure rail passenger travel."
Eight people were killed in the derailment, and 200 injured. Eight people remain in critical condition.
