The discovery was made shortly after 9:00 p.m. aboard a route 100 high speed line train.
The train just pulled into the 69th Street Terminal, which is the end of the line.
All the passengers exited except the man, who, by accounts, appeared asleep or unconscious. After trying to wake the man, it was determined he was dead.
Police and the medical examiner were called.
There were no obvious signs of foul play, according to officials.
