The accident, which forced the evacuation of residents of Heimdal, North Dakota, occurred less than a week after the US government announced new regulations for shipping crude oil by rail.
An oil train derailment and explosion has occured nearby Charleston, West Virginia and comes a day after an accident in a remote area of northern Ontario.
The review is essentially the last step in the regulatory process, and environmental groups are worried that the rules remain insufficient for preventing potentially catastrophic accidents.
Environmental groups and rail industry watchdogs worry that US regulators are moving too slowly and too passively in taking aging and accident-prone tanker cars off the nation's railways.
As if the damage done to Lac Mégantic by a derailed train owned by the Montreal Maine & Altantic Railways, the company has refused to pay over $4 million to the town, and is planning to file for bankruptcy.