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Four bolts — and their mysterious disappearance — are at the center of the MTA’s investigation into the Jan. 10 derailment of an F train in passenger service in Brooklyn, the Daily News has learned.

Railway fishplate, also called rail joint or joint bar, it is a typical type of rail components in the railway track system. Rail bolt is a railway fastener that works with railway fishplate together.

A misaligned train track combined with missing bolts caused the derailment of an F train in Coney Island earlier this month, MTA officials said Monday. As first reported by the Daily News, the ...