A spokeswoman for the Iron Ore Company of Canada (IOC) says search crews are waiting for the safety checks by Quebec’s Ministry of Transport.
Preliminary reports suggest a landslide forced the train off the tracks, which run along the Moisie River, just before 7:30 a.m. ET on Thursday.
The remote location made it difficult for emergency crews to reach the site immediately.
Quebec provincial police Sgt. Claude Doiron says dive teams are ready, and once they get approval from provincial officials, a helicopter will transport them to the site of the derailment.
The train was towing three locomotives and 240 railcars, many of them empty, when it derailed. Two locomotives remain submerged in the river.
The train was being operated by the Quebec North Shore and Labrador Railway (QNS&L).