There were no immediate reports of injuries or a hazmat situation in the five-car derailment, which occurred shortly before 4:30 a.m. near the intersection of Main and Lamar streets. The train cars, two of which are for automotive transport, remained upright after the crash.
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Los Angeles Fire Department firefighters responded to the scene, near a UPS facility just north of Union Station.
Metrolink and Metro Gold Line service were not affected by the incident, according to the agencies.
The cause of the derailment was unknown.
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DEVELOPING: More details will be added to this report as they become available.