Thirty-three people were injured when two trains collided in Chicago, on Monday morning.
None of the injuries were serious and everyone was released from the hospital by Monday evening.
Authorities say that a parked train, which was undergoing repairs, managed to slip from it's brakes.
It then went through two switches, which should have stopped it, before striking the other train at about twenty miles per hour.
The National Transportation Safety Board is conducting a full investigation of the incident.

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