An LIRR rider was slashed in the face on a train in Queens on Monday in a horrifying caught-on-video attack — days after an armed straphanger launched violence that ended with himself shot in the head.

Monday’s crime occurred when a 27-year-old man tried to board a Long Island Rail Road train at the Locust Manor station around 3:50 p.m. and a 32-year-old male suspect was blocking the entrance, a witness told ABC.

The victim asked the guy to move and was able to eventually board the train. But he was soon approached by the suspect, who asked him if he “had something to say to him,” the outlet said.

A slashing just happened on the Far Rockaway LIRR train at 3:45pm. #mta #lirr #nyc pic.twitter.com/pQJWw4TUGg

The pair started to argue, and the suspect ended up jumping on top of the younger man in his train seat, repeatedly walloping him and slashing him in the face with a box cutter, according to the NYPD and cell phone video of the incident.

The suspect was beating the younger man so hard that one of the attacker’s sneakers fell off — so he grabbed it and beat his victim with that as well.

A third man rushed over in an apparent effort to break up the violence, footage shows.

The suspect was taken into custody, and the victim was hospitalized, according to the NYPD.

Neither of them has been identified.

The MTA confirmed that the attack happened on the 3:22 p.m. train from Grand Central Terminal in Manhattan to Far Rockaway, Queens, and said the train was held for 50 minutes while officials investigated.

“Weapons have no place on trains, and we are grateful for the rapid response of NYPD officers who kept passengers safe and arrested the perpetrator,” MTA spokesperson Meghan Keegan said.

The scary random violence came after a maniacal subway rider pulled out a gun while taunting a stranger on an A train in Brooklyn during evening rush hour Thursday, possibly because he falsely believed his target was a migrant, sources said.

The deranged man was shot four times with his own weapon by his would-be victim, who wrestled it away from him in what authorities ruled was a case of self-defense as commuters scurried away in terror.

The scary random violence came after a maniacal subway rider pulled out a gun while taunting a stranger on an A train in Brooklyn during evening rush hour Thursday, possibly because he falsely believed his target was a migrant, sources said.

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