Officials say the fire appears to hav been electrical.
A witness on board the train says he heard a loud explosion and saw flames as the train was pulling in to the station.
"There was a bunch of rattles under after the first explosion. And everyone was trying to get off after the train came to a stop. And it was just chaotic, nobody had - it was just every man for himself," said John Walsh, Red Line Passenger.
At least 5-ambulances were called to the scene but no injuries were reported.
The Red Line is now back running its normal schedule.