TORONTO — Three employees and the railway company involved in last summer’s massive explosion of a runaway oil train that incinerated much of a small town in Quebec, killing 47 people, will face criminal negligence charges, prosecutors said.

The charges come about 10 months after more than 60 of the tankers carrying oil from North Dakota came loose in the middle of the night, sped downhill for nearly seven miles and derailed in the town of Lac-Megantic. At least five of the tankers exploded, leveling about 30 buildings.