The derailed train was at the 7th Street/Metro Center Station, but the train remained upright, and there were no injuries. The issue with the train occurred before 3:30 p.m., according to the Los Angeles County Metropolitan Transportation Authority.
Around 9:45 p.m., Metro reported that normal train service had resumed. The lengthy delay was caused by the time it took to remove the disabled train.
The derailment forced major delays on the A Line, which connects Long Beach to Azusa, and the E Line, which connects Santa Monica to East Los Angeles.
Light rail service was halted at 7th Street/Metro Center Station, and service was also potentially disrupted — depending on the train line — at Grand Avenue Arts/Bunker Hill Station, Historic Broadway Station, and Little Tokyo/Arts District Station.
As a result, the A Line had been only operating between Long Beach and Pico Station, and then from Union Station to Azusa.
Similarly, the E Line was only operating between Santa Monica and Pico Station, and between Historic Broadway Station and East Los Angeles.
It was not clear Tuesday what caused the derailment.
City News Service contributed to this report.