Investigators also are expected to scrutinize the bridge's design, Sumwalt said.
WSJ: Mo. highway buckles after rail cars hit overpass
2.
Many of the recommendations "are going to be unpopular, " Sumwalt said.
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3.
"That group will also be looking at human performance, how the crew interacted, what was going on the bridge of that vessel" before the collision, Mr. Sumwalt said.