Responders were dispatched to Ridgefield on Tuesday night for reports of a fire on a train, according to emergency radio traffic monitored at The Columbian.
Firefighters responded at 6 p.m. to the intersection of Mill Street and North Railroad Avenue for a commercial fire.
Dispatchers said that a woman reportedly started a fire on a train before getting off, according to the radio traffic. Fire crews determined that it was a cigarette discarded in a trash can.
The first arriving crew said only smoke was visible — there was no fire by the time they reached the train. Firefighters helped ventilate the train, according to the radio traffic.
An asthmatic passenger on the train had to be treated for smoke inhalation, according to the radio traffic.
Responders shut down the train tracks in both directions during their response.
Law enforcement was still searching for the woman who reportedly ignited the fire as of 6:20 p.m.