The brawl erupted after dozens of Arab and Jewish girls clashed on one of the train cars. At one point, a Jewish girl at the site pulled out a personal canister of tear gas and sprayed it at the Arab girls.
The gas spread throughout the train and hurt other passengers uninvolved in the incident. Following the subsequent commotion, the driver was forced to stop the train and let passengers out, as the gas was bothering those onboard.
CityPass, which operates the Light Rail line in the capital, issued the following response after the incident: "We will not be accepting any act of violence. We call on all residents to show tolerance."
The latest incident was not the first sign of trouble involving Jerusalem's new city-wide train, which was inaugurated earlier this year. Last month, stones were hurled at a train traveling through the capital's Shufat neighborhood, near the Israel Police National Headquarters. A windowpane was smashed but no injuries were reported in that incident.