Awesome timing, to have a landslide hit the front of the train just as it passes by.
I see snow, given that the rail line seems cut into the cliff its possible that a change in temperature triggered the slide. The question is did the rail company regularly do maintenance and inspections on the track (including the cliff) at this point? An investigation will have to be done to sort out all the factors.
This is the first time I ever remember Labrador City ever being mentioned in the news.