The story itself seems eerily similar to the plans that various muslims arrested in Canada claimed to be planning.
CTV has this info as well as rotating videos on the story:
How it happened
Montreal Maine & Atlantic Railway Inc., which owns the train, says the train was unattended and “came loose” overnight.
A representative from the company told CTV News that the trained was parked and secured in Nantes, Que., just west of Lac-Megantic, late Friday night. The two town centres are about 12 kilometres apart.
Joe McGonigle, a vice president at Montreal, Maine & Atlantic, said the train “came loose” between 1 a.m. and 1:30 a.m. on Saturday morning and “started rolling down the tracks.”
He said the train’s engine was found about one kilometre from where the explosions took place.
The train’s conductor, who was at a hotel in Lac-Megantic when the train derailed, is being questioned by police, according to McGonigle.
According to the company’s website, the railway serves Maine, Vermont, Quebec and New Brunswick and owns more than 800 kilometres of rail tracks.