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There is one detail that is still missing from the timing sequence of events as the truck encountered the crossing.  We are told that the truck entered the crossing seven seconds after the signals activated.  Here is what we still don’t know: Where was the truck when the signals first activated?  The truck could have been standing just short of the crossing at that instant, waiting for the truck ahead to move—OR—the truck could have been perhaps 100 feet away and rolling up to the crossing.
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