Investigators are analyzing tire tracks in the mud to determine whether the truck driver at the center of the deadly Amtrak crash had tried to go around the crossing gates and beat the train.

TT File PhotoThe crossing gates were down and the signal lights were flashing when an Amtrak train slammed into a truck loaded with steel in the nation's worst railroad accident since 1993. Federal safety investigators are hoping the engineer and the truck driver can explain why the truck was straddling the tracks, causing a crash that killed at least 13 and injured more than 100. br clear=all>