WASHINGTON (AP) - Transportation officials say a train derailment in Maryland that resulted in the death of two young women caused $2.2 million in damage.

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The National Transportation Safety Board, which is investigating the accident, released a preliminary one-page report Wednesday.

The report does not state a cause of the accident that occurred just before midnight Aug. 20 and largely confirms what investigators had already said.

The probable cause of the accident will be determined after a full investigation to be finished in 12 to 18 months.

The train, which was carrying coal, was traveling at the authorized speed of 25 mph when it derailed in Ellicott City.

The two young women who died were sitting on a railroad bridge at the time of the derailment and were buried in coal.