We're learning new information about a train derailment that left more than 20 people injured.
The crash happened back on June 1st at the Louisville Zoo.
27 NEWSFIRST has learned that the 18-year-old operator of the train had just begun driving the ride by herself that day.
Investigators are still trying to determine what caused the train to derail.
It's not the first time a train that overturned at the Louisville Zoo.
The Courier-Journal is reporting that in October 2007, another accident happened during Halloween festivities, when the front axle broke on one of the cars.