Rosekind said the south traffic light at the grade crossing turned green 21 seconds before the train's arrival at the crossing, as designed, to allow traffic time to clear the crossing. At 20 seconds before the collision, the bells and lights on the mast activated, in keeping with the minimum time under federal law.
At 13 seconds before the collision, the gate started coming down, and a second later, the front of the accident truck crossed the north rail of the tracks.
The engineer sounded the horn nine seconds before impact. And at seven seconds before impact, the lowering gate struck flagpoles on the float.
The train's emergency brakes were applied five seconds before impact, but it took the train 75 seconds to come to a complete stop, Rosekind said.
Rosekind said investigators would remain on the scene through much of this week and said a conclusion to their work is months away.
Investigators are reviewing video from a forward-facing camera on the locomotive, and video from a dashboard camera on a police cruiser that was behind the parade float, Rosekind said. They are also examining information on a data event recorder on the train, which recorded the train's speed, horn, etc.
The grade cross where the accident occurred had been designated a "quiet zone." Typically, trains blast their horns a quarter mile before the crossing. But the city of Midland applied to designate the crossing a quiet zone.
Rosekind said alternative safety measures are provided in quiet zones. "Our investigators will now be looking at exactly what those safety measures were and whether they were in place at the time of the accident," he said.
The safety board will also be looking at the parade permits to see what conditions were placed on the parade, and whether those conditions were met.