The attack happened around 12:15 p.m. on Monday, at the Spuyten Duyvil station.
Police say a man wearing a blue hat with "New York" in white letters, and a gray coat with a scarf, attacked an elderly man, unprovoked, with a traffic cone.
The victim suffered a cut to the head as a result of the blow.
The suspect then fled from the scene in an unknown direction.
No arrests have been made, and the investigation is ongoing.
Authorities urge anyone who can identify or has any information regarding the whereabouts of the pictured individual, to contact the MTA Police tip line at 212-MTA-POLICE (212-682-7654).
Callers can remain anonymous when providing information on suspects or the investigation.
----------
* More Bronx news
* Send us a news tip
* Download the abc7NY app for breaking news alerts
* Follow us on YouTube