The TSB report and recommendations will be made public at 10:30 a.m. EST.
But some residents of Lac-Mégantic say they’re not sure the answers in the report will satisfy those still grieving, many of whom want to see Transport Canada found responsible.
Marilaine Savard, who helped create a Lac-Mégantic citizens group, said there's a sense that the government is partly to blame for the disaster.
"We feel that these people are never going to admit their share of responsibility," she said.
The aim of the TSB report is not to assign blame for the disaster. The agency’s mandate is to look for ways to prevent a similar accident.
In January, the TSB made urgent recommendations to revise the way materials like crude oil are carried by rail, including tougher standards for the DOT-111 rail cars — the tankers involved in the Lac-Mégantic derailment— that are widely used in the oil-by-rail industry.
The recommendations were announced in response to "three critical weaknesses" the agency said it discovered in the rail system during its investigation.
Transport Canada has already made changes based on the TSB findings, including a new requirement that emergency response plans be prepared for all crude oil, gasoline, diesel, aviation fuel, and ethanol rail transportation.
The TSB report is expected to focus on possible human error, the tankers that were transporting the volatile crude oil and the brake system used on the train.