The derailment happened Thursday, and Emergency Management BC (EMBC) says an environmental emergency response officer been deployed.
The rail line reopened overnight, CP spokesman Jeremy Berry said.
On Thursday, crews discovered a hole in the vent line of the train engine’s fuel tank.
It has now been patched up but fuel did manage to leak over a steep bank into the Fraser River, said EMBC.
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Officials said crews are working to assess how much fuel was spilled and the environmental impacts.
One of the empty grain cars laying on top of the train’s engine was removed on Thursday, and crews are working to remove the second according to EMBC.
The province said affected First Nations have been updated on the situation, and will continue to be notified of ongoing response actions.
CP Rail has yet to comment.