A violent attack of two Long Island Rail Road conductors caught on camera is leaving commuters and union leaders feeling rattled Friday.

Metropolitan Transportation Authority police say a 17-year-old was riding a West Hempstead branch train that was headed toward Atlantic Terminal when the conductors asked him to pay.

The teen allegedly refused and took a ticket-issuing machine from one conductor and started hitting him in the face with it.

Anthony Simon, chairman of the union that represents conductors, said the conductor tried to defend himself, but suffered multiple face fractures. Simon believes the assailant got on the train at Jamaica and the assault happened west of the station.

"Then the assistant conductor came in and tried to help, then he got hit five or six times in the face as well, and thrown around the train," Simon says.

Police say the boy fled the train at the East New York station but was arrested shortly after. He was charged with two counts of felony assault in the second degree and one count of robbery in the second degree.

MTA Police Chief John Mueller said in part in a statement, "Having made a rapid arrest, it is now up to prosecutors to ensure the law is enforced, so this violent perpetrator faces consequences, and the victims receive the justice they deserve."

One of the conductors is from Long Island and the other is from Queens. Both were treated and released from a hospital.

The MTA said that they would not comment on patrol numbers for security reasons, and wouldn’t say if the department would review safety measures following the incident.