The US National Transportation Safety Board (NTSB) and the Transportation Safety Board of Canada (TSB) on Thursday urged their respective regulatory agencies to put in place strong rules that will improve safety conditions for oil-by-rail shipments.

The NTSB said it "is concerned that major loss of life, property damage and environmental consequences can occur when large volumes of crude oil or other flammable liquids are transported on a single train involved in an accident".

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