Chemical fire starts in Ky. detrailed train A derailed train carrying chemicals in southern Jefferson County has caught fire, forcing officials to order the evacuation of anyone who lives within a 1.2 mile radius of the accident site. A tanker train derailed in south Jefferson County on Monday morning, CBS affiliate WLKY in Louisville, Ky. reported. On Wednesday afternoon, a blast occurred after five workers tried to use a blowtorch to separate two cars and accidentally ignited residual chemicals. Three workers were sent to the hospital. Two are in fair condition and one remains in critical condition as of Thursday morning. Firefighters attempted to quell the flames which were 10 feet away from another car full of explosive chemicals, WLKY reported. After successfully extinguishing one fire, authorities decided it was best to let the other fire burn out. Officials had initially said that the fire, fueled by a pressurized chemical that was being carried by a railcar, would burn itself out within two hours. However, Doug Hamilton with Metro Louisville Emergency Management says the fire is expected to continue burning through the day Thursday. Officials said Thursday that they were given inaccurate information about how much of the flammable chemical remained inside the car. In total, 155 homes and businesses were ordered to evacuate to nearby shelters on Wednesday afternoon, according to WLKY. People who lived within a 5-mile radius of the site -- affecting over 2,300 addresses -- were ordered to stay indoors. The blaze is contained to one tanker, but flames continue to shoot out of the overturned car.