The body was found around 6:30 a.m. on the Passaic Avenue bridge about a hundred yards from the station, NJ Transit's Nathan Rudy said.
The Passaic County Prosecutor's Office, which was investigating, didn't immediately say whether homicide or suicide was suspected.
A Medical Examiner was to determine cause of death.
The incident didn't cause any significant delays on the Main Line, Rudy said.
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