The incident happened at about 5:08 a.m. on the train due to arrive at Grand Central Terminal at 6:19 a.m, NBC Connecticut said.
As the train, which originated in Stamford, pulled into Riverside, workers began to investigate power outages onboard, found the man atop the train and used a fire extinguisher to put out the blaze, NBC Connecticut said.
The man had jumped onto the moving train near the Greenwich/Stamford border, NBC Connecticut said.
The man was still alive and transported to Westchester Medical Center, NBC Connecticut said.
Read the full story here at the NBC Connecticut website.
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