Broken rail caused fatal Colorado train derailment, bridge collapse

A broken rail caused a train to derail in Pueblo, Colorado, resulting in the collapse of a bridge onto Interstate 25.
coal cars spilled onto the highway, killing a semi-truck driver who was passing under the bridge at the time.
No injuries were reported among the train crew, but the interstate remains closed several days later as cleanup continues.
The National Transportation Safety Board is investigating the cause of the rail break and why detection systems did not warn crews.
Transportation Secretary Pete Buttigieg and federal investigators are assisting local authorities with cleanup efforts and determining responsibility.