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Police say it happened just before 11 p.m. Monday on board a 7 train at the Grand Central station.
Police say the victim got into an argument with the suspect over loud music. They say the suspect pulled out a knife and slashed the victim, a 37-year-old man, in the face.READ MORE: NYPD: Man Shot Inside Union Square Subway Station
The suspect then got off the train and got away.
The victim was hospitalized in stable condition.MORE NEWS: 'Squid Game' Halloween Costumes Banned By New York School District Due To Netflix Hit's 'Violent Message'
Anyone with any information is asked to call the NYPD’s Crime Stoppers hotline at 1-800-577-TIPS (8477), or for Spanish, 1-888-57-PISTA (74782). You can also submit a tip via their website or via DM on Twitter, @NYPDTips. All calls are kept confidential.