York Regional Police say a train derailed in Georgina early Sunday morning.
It happened in a rural area near Pefferlaw Road and Johnston Street around 3:45 a.m.
The CN freight train was carrying copper concentrate, a non-hazardous material.
No one was injured and there were no evacuations in the area.
CN says the 85 car train was headed from Winnipeg to Toronto when 15 of the cars left the tracks.
According to a statement released by CN, crews will be working “around the clock” to clear the damages.
Workers from as far away as Buffalo, N.Y., were called in to help right the cars and remove damaged rails.
CN said the cause is still under investigation and the road at the train crossing will remain closed for the rest of the day but will be open tomorrow morning.
With files from Corinne Van Dusen and CTV