and not enough gravel in the railroad bed combined to put strain on the track along curves. That strain loosened the bolts holding the rails to the rail ties and pushed the rails apart ...

Steve Holm and three other inspectors drove right over a set of broken railroad bolts that later would cause a massive oil train explosion. Holm rode shotgun as Union Pacific Railroad’s ...

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Union Pacific Railroad said it will replace a type of ... The report flagged broken "lag bolts" as the immediate cause and said better inspections would have caught the issue.