Metra said that trains will be stopping at the station Thursday despite the fire, but that the ticket office is closed.
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Firefighters responded shortly after 11 p.m. to the fire. According to authorities the fire started in a storage room where the furnace was located.
On Friday, fire investigators said the fire was accidental and appeared to have been related to a heater unit that was malfunctioning.
Authorities said no one was in the building at the time of the fire.
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On an average week day more than 1,500 people use the station.