A news release from the company says two of the cars released some oil, but it says those leaks have been stopped.
Two neighbourhoods in Sturgeon County were evacuated as a precaution, affecting about 46 homes, but the county announced several hours later that the evacuation was over.
A news release from the county says only a small amount of crude leaked — between 30 and 50 litres.
CN spokesman Patrick Waldron says there’s no reports of the oil leaking into a waterway.
“We have personnel on the scene working with emergency responders, and more resources are being mobilized to continue that response and complete a full assessment of the incident,” Waldron said by phone earlier on Sunday.
There were no reports of injuries.
CN says environmental teams are on the scene to begin a clean-up.
The railway says the cause of the derailment is under investigation.