Was it AmTrak's fault?

Certainly embarrassing to wreck a train full of Congressmen.   The train hit a truck at a grade crossing doing 70  mph.  Killed the truck driver, shook up a lot of Congressmen who were not in their seats.  Train stayed on the track, which is a good thing. 
   I think the fault lies with the truck driver.  The grade crossing was protected, crossbucks, automatic red flashers, and automatic crossing gates.  On TV you could see that the crossing gates were down.  We can assume that the crossing protection gear functioned,  that stuff is pretty reliable and I cannot remember a case where it failed to work.  Still, someone ought to check that, just to be sure. So how did that truck get on the tracks?  Either he got stuck on the tracks before the train arrived, or he was in a hurry and drove around the crossing gates.   So far the newsies have not said anything about that.  And, why did not the people in the truck get out and run when they heard the train coming.  Trains are required to whistle (sound the horn now a days) as they approach grade crossings, two longs, a short and a very long.  Those horns are loud, easily heard over the sound of a truck engine.