MTA spokeswoman Margie Anders said the agency began planning for a PTC system as soon as the law was put into effect.
“It’s not a simple, off-the-shelf solution,” she said.
The derailment came amid a troubled year for Metro-North and marked the first time in the railroad’s 31-year history that a passenger was killed in an accident.
In May, a train derailed in Bridgeport, Conn., and was struck by a train coming in the opposite direction, injuring 73 passengers, two engineers and a conductor. In July, a freight train full of garbage derailed near the site of Sunday’s wreck.