Passengers onboard an eastbound Market-Frankford El train made a gruesome discovery earlier today, SEPTA said.

Just before 4 p.m., a passenger on the train called police, saying a man was unresponsive on the train, said SEPTA spokeswoman Kristin Geiger.

The train was stopped near the station at 46th and Market streets, where police boarded it to investigate.

They found the man, 47, slumped in his seat. He was pronounced dead shortly after by emergency medical personnel.

Preliminary information indicates the man's death is not suspicious, but investigators are continuing to probe the incident, police said.

No arrests were made.