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I wonder if the engineer set or dumped the air a substantial distance before impact; possibly even before the signals activated.  With a pair of flatbed trucks stopped at the light and one of them fouling the track.  An engineer might take preemptive action upon seeing a high probability of the truck not clearing in time.  Engineers are probably aware of the tendency for vehicles to back up on the crossing when waiting at the traffic lights there.  I read that it took a half mile to stop.  That suggests to me that they started braking prior to reaching the crossing, and had slowed down considerably by the time they hit the trailer.  I base that on seeing the trailer still upright and connected to truck tractor, but turned 90 degrees to it.  It suggests to me that the train hit the last few feet of the trailer at moderate speed, causing it to quickly pivot into the clear, pivoting on its connection to the tractor.
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