Crew members on a non-revenue train discovered the man's body around 6 a.m. near the Hackettstown Train Station, NJ Transit spokesman Paul Milo said.
NJ Transit police were investigating the incident possible train strike, although no NJ Transit trains reported a pedestrian strike.
The tracks in which the body was found are shared by other rail companies including Norfolk Southern.
Norfolk Southern officials did not receive any reports of a pedestrian strike Monday morning in Hackettstown, according to company spokeswoman Rachel McDonnell Bradshaw.
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