The train was traveling on an elevated part of the city’s rapid transit system on the newest Line 12, also known as the Golden Line, when part of the overpass collapsed onto traffic below, Mexico’s Secretariat of Risk Management and Civil Protection said.

The incident happened at 10:25 p.m. local time, according to Mexico City’s Interior Minister Alfonso Suarez Del Real.

A crane was working to hold up one subway car left dangling on the collapsed section so that emergency workers could enter to check the car to see if anyone was still trapped. Mayor Claudia Sheinbaum said. She said 49 of the injured were hospitalized and seven were in serious condition and undergoing surgery.