CN Rail says its crews completed repairs to the tracks near Gogama, Ont. Tuesday night and re-opened the rail line to train traffic about 10:30 p.m.

"Trains have resumed running through the derailment area at a reduced speed due to the ongoing clean-up work at the site," wrote CN Public Affairs' Patrick Waldron.

"CN’s environmental team continues to work closely with the Ontario Ministry of Environment on mitigation, monitoring and restoration plans as part of the ongoing clean up."

Crews have constructed berms and deployed containment equipment, including booms and absorbent materials to contain the spilled crude oil to the derailment area.

Waldron noted that firefighting experts have allowed a controlled fire involving two tanker cars to continue to burn.

"Those cars are a safe distance from the tracks and present no danger to rail operations or ongoing clean-up work being done in co-operation with key stakeholders, including TSB and the Ontario Ministry of Environment," he continued.

Waldron said the rail cars involved in the crash were CPC 1232 tank cars — ones not owned by CN. They derailed from a train of 100 loaded cars.

"A complete assessment of the cars and the amount of product spilled is still ongoing," he added.

"As the co-ordinated clean-up continues, the incident remains under investigation by the Transportation Safety Board. The speed of the train is part of that and CN will decline to comment on the TSB investigation."

Waldon noted "the train was visually inspected four times during its trip and passed over a wayside safety detector approximately 20 miles before the derailment, with no issues identified."

"The track was last inspected visually Saturday morning, and inspected with [a] rail flaw detector and geometry test car within the last week," he said.