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The train remained upright. There were no known injuries.
There were 250 passengers on board.
The train was headed for Huntington Station.
Service remained suspended until early Thursday evening east of Hicksville on the Port Jefferson branch.
There were residual delays of 30 minutes westbound and 10 minutes eastbound.
LIRR was investigating whether a water main break on Avery Road caused water to gush up and carry debris over the crossing, causing the derailment.
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