NEW YORK - The results of a federal investigation into safety at Metro-North were released Friday. 

The Federal Railroad Administration's review says the railroad has a "deficient safety culture."

The review found that the railroad's overemphasis on punctual performance had a detrimental effect on safety.

The 31-page report also cites an ineffective training program and problems like cellphone use among workers on the job.

The investigation comes after a number of incidents on the railroad, including a derailment last December that killed four people when a speeding train jumped the tracks in the Bronx. 

Metro-North President Joseph Giulietti says the report confirms his initial assessment of the railroad. He said safety must come first and he will not allow any trains to run unless he's confident that they will run safely.

Metro-North has to submit plans of action to the Federal Railroad Administration within the next 60 days.