All three of the 'incidents' look faked to me.
The first one definitely looks edited, you can see the leaves on the left shift when the shot of the train gets superimposed (poor choice of location there), the massive bloom effect to cover the end of the train passing is a blatant giveaway, and they did a horrible job of the colour correction. So long as I picked a better location for the shoot, I could have done a more convincing job with about 15 minutes of editing.
The second one with the cyclist also looks as if it was staged by a stunt rider. Most real cyclists would have grabbed a fistful of rear brake and hit the deck as their rear wheel skidded and washed out underneath them, probably seeing them slide underneath the barrier instead of the more dramatic collision with the barrier.
The third one has been filmed from a typical CCTV camera location, but the footage is clearly too good to be from a proper CCTV camera - again, something that more competent editing (i.e. adding a lo-fi look effect) would have solved.
The sound effect at the end is clearly a recorded effect added in.
If you're going to stage it, you may as well go all the way and do a properly well-produced ad instead of just trying to cook up 'real' footage. Like this classic campaign from 2005 where the ad agency did a brilliant job of showing the 'impact' without being too gory to put on TV.
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