The attack happened around 7 p.m. on January 17 at the 34th Street-Herald Square subway station.
According to the NYPD, the suspect approached the 44-year-old MTA employee and punched him in the face before fleeing the scene on foot.
The worker suffered minor injuries as a result of the attack. He was taken to the hospital in stable condition.
Anyone with information about the incident is asked to call the NYPD's Crime Stoppers Hotline at 1-800-577-TIPS (8477).
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