Surveillance footage shows a man being punched in the face by the younger suspect as he approached the Raymond Plaza East exit of Newark Penn Station around 7:20 p.m. March 6, officials said.
The victim fell to the ground, lost consciousness and suffered gashes on his face and back of his head, police said.
The suspect fled the scene and is believed to have boarded a train bound for Penn Station New York.
The suspect is described as a black male, between 35 45 years old, wearing a black leather three-quarter length jacked, a yellowish-green t-shirt, black/white winter cap, dark pants with a graphic design on the left leg, and carrying a black backpack at the time of the assault.
Anyone with information is urged to contact NJ Transit Police Central Communications at 800-242-0236.
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