As far as we are aware, no, CN has no plans in case of emergency. There's no emergency plan for evacuation and there's no emergency plan for cleanup of any chemicals that could be spilled in the area.
Just from personal experience, I can tell you that when you come home late at night you can see the cars parked not in the shunting yards but on the rails that pass through the neighbourhood. You can see the cars parked there with all kinds of chemicals. You just have to look at the side of the car to know that it's not a boxcar full of car parts or something innocuous like that. It's a car full of chemicals, and it's just sitting there. There's no protection, there's no guard, there's no nothing; it's just sitting there in our neighbourhood. Combine that with a lack of emergency plans and it could just be....
I don't want to sound like an alarmist, but if something happened, yes, it could be a recipe for disaster.