I just wanted to post a link in regards to the train wreck tragedy in Lac Megantic. Many of the victims were burned, and the article explains how they go about identifying the many deceased.
http://www.cbc.ca/news/canada/story/2013/07/09/f-forensic-identification-lac-megantic.html
A primary challenge will be locating human remains among the debris, which is largely all the same colour after being exposed to fire for such a long period, says Rogers.
"Because of the range of conditions that bodies may be found in, it takes a person with a lot of experience to differentiate between what might belong to a human from what is a piece of a building, for example," she says.
Inkster says that although many of the victims' remains will likely be severely damaged by the explosion and subsequent fire, it's exceedingly rare that investigators fail to find enough physical evidence to identify remains.
http://www.cbc.ca/news/canada/story/2013/07/09/f-forensic-identification-lac-megantic.html