Meanwhile, attention focused on the CEO of the railway's parent company, who faced jeers from local residents and blamed the train's engineer for improperly setting its brakes before the disaster.
Officials said yesterday evening that 20 bodies had been found in this burned-out town, and 30 people were missing.
"We informed them of the potential loss of their loved ones," said Quebec police inspector Michel Forget, who came to an afternoon news briefing from a meeting with families of the dead and missing. "You have to understand that it's a very emotional moment."
All but one of its 73 cars was carrying oil, and at least five exploded.
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The crash has raised questions about the rapidly growing use of rail to transport oil in North America, especially in the booming North Dakota oil fields and Alberta oil sands far from the sea.
The intensity of the explosions and fire made parts of the devastated town too hot and dangerous to enter and find bodies days after the disaster. Only one body had been formally identified, said Genevieve Guilbault of the coroner's office, and she described efforts to identify the other remains as "very long and arduous work."
Burkhardt said the train's engineer had been suspended without pay and was under "police control."
Investigators also had spoken with Burkhardt during his visit, said a police official, Sgt Benoit Richard. He did not elaborate.
Until yesterday, the railway company had defended its employees' actions, but that changed abruptly as Burkhardt singled out the engineer.