I'm with profwebs in that I don't feel much sympathy for the driver of the car. As for the train crew, I'll bet they're glad that everyone gets to see their side of the accident.
Let's look at the video and see what happens and when:
0:02-0:05: engineer blows horn
0:06-0:07: bell rings (may have begun ringing earlier though)
0:08-0:09: engineer blows horn
0:10: engineer blows horn (very short blast)
0:11-0:12: engineer blows horn as train enters crossing and strikes car
0:12-0:13: very loud sound, presumably that of engine striking the car
0:12: it appears broken glass or other debris flies up into windshield
0:21-0:24: a noise gradually gets louder. I don't know if it's the dynamic or air brakes, or both, activating.
Bell continues to ring; I can't tell when it stops ringing
0:53 or 0:54: train stops
2:25-2:26: conductor appears
2:45: video ends (except for credits to the Canton Police Department)
The bell begins ringing as soon as the horn is blown. It's automatic. You can ring the bell without blowing the horn, but AFAIK you cannot stop the bell from ringing if you blow the horn.
And air brakes make a wooshing sound, almost like an old steam radiator blowing off steam. They may also make a high pitched squealing sound like you get on your car when your brakes wear down. I could be wrong about that noise being the dynamics kicking in, but that is definately not the air brakes.