The Federal Railroad Administration has recommended commuter railroads look at where they have sharp track curves and adjust their automatic train control safety systems to prevent trains from going too fast there, like an Amtrak train did before it derailed in Philadelphia last month.

If automatic train control isn't available, then the train should have a crew member beside the engineer who's familiar with the route and briefings about where speeds are reduced. The second person would have to be in constant contact with the engineer.

The administration's safety advisory also suggests railroads add more warning signs about speed. The administration says Monday's advisory is the latest in a series of steps it has taken to keep passenger railroads safe.

After a deadly crash two years ago, changes were made at the curve near the Spuyten Duyvil Metro-North station.

The nation's railroads face a deadline at the end of this year to install the advanced crash-prevention system, but many of the railroads are expected to miss the deadline. Metro-North isn't expected to have the system in place until the end of 2018.