 I'm Monica Ricks. Some neighborhoods near Chicago are getting evacuated now following a massive train derailment. CBS Chicago reporter Suzanne Lemignon is in Madison. There are 20 cars that have been involved in this freight train derailment. They are carrying various substances. At least one car may be leaking. It's still unclear what's leaking or how this derailment happened. If you're flying today, be prepared for big crowds. There's one tip I can give you and it's get