THE BRONX - The NTSB is calling on the MTA to put new safety measures in place in the wake of December's fatal Metro-North derailment.

The Hudson Line train, headed to Grand Central Station, derailed near the Spuyten Duyvil station in the Bronx. Four passengers were killed and dozens were injured. Investigators say the train was going 82 mph in area where the speed limit was 30 mph. 

The NTSB wants permanent speed-limit signs placed near all stops on every line to alert conductors of when they need to slow down. The MTA is also being asked to place audio and visual recording devices in all train cars and to regularly review anything that's recorded.

December's accident remains under investigation.