The couple of news reports I've seen are kind of light on the details. First thought is that somebody made a major rules violation, but who, what and why will have to await a lot more information.
Appears a train hit a pair of boom/crane trucks working on the electrification project.
https://abc7news.com/caltrain-accident-crash-train-san-bruno-huntington-avenue/11639614/
Greetings from Alberta
-an Articulate Malcontent
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