NEW YORK (CBSNewYork) — Metro-North is testing new safety measures — installing cameras to monitor key areas, and deter crime.

The move came in response to federal recommendations following the 2013 Spuyten Duyvil derailment.

READ MORE: With Injuries Piling Up Across New York City, Mayor De Blasio Is Considering Bicycles Being Required To Have License Plates

Four people were killed and 70 others injured when the engineer fell asleep at the controls.

READ MORE: Bronx Man Takes It Upon Himself To Clean Up NYC Park, But City Says Not So Fast

Metro-North officials said the cameras will monitor the engineer’s control area, track, and passenger areas.

They’re being tested on some Harlem and Hudson line trains.

MORE NEWS: New York City Subways Resume 24-Hour Service