DIEPPE, N.B. -- The Transportation Safety Board of Canada will release its final report on Friday into the derailment of a freight train that caught fire in northwestern New Brunswick last year.

A year ago, the board said a broken wheel was a factor in the derailment of the CN (TSX:CNR) train in January 2014 near the village of Plaster Rock.

It was hauling crude oil and liquefied petroleum gas when 19 cars and a locomotive went off the tracks, sparking a fire that burned for days.

The board said shortly after the derailment that its investigation would centre on a cracked wheel near the front of the 122-car train, which was en route to Moncton, N.B., from Toronto when it derailed.

No one was hurt in the derailment, but 150 people in the surrounding area were forced from their homes as the fire burned.

The board said last June that the wheel, located on the 13th car, was manufactured in 1991 and had a crack under its surface that led to a shattered rim.

Investigators also determined that the wheel came off the track about 16 kilometres before the other cars derailed.

The board's report is being released in Dieppe, N.B.