A stranger slashed a 21-year-old man in the face in an unprovoked attack on board a Bronx train late Thursday, cops said.

The victim was riding a southbound No. 6 train passing through the Zerega Avenue station around 11:45 p.m. when a maniac randomly cut him on the left side of the face with a sharp object, police said.

The attacker got off the train, leaving the wounded man on board, authorities said.

A brute randomly slashed a 21-year-old man on his face on board a southbound No.. 6 train passing through Zerega Avenue, cops said. Christopher Sadowski

The victim got off the train at the next stop, Castle Hill Avenue, where he called 911 and officers responded, police said.

He was taken to Jacobi Medical Center, where he was listed in stable condition, cops said.

The attacker – who

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