UPS and USPS both ship a large number of packages by rail, typically in trailers on flat cars. It's not unusual to see entire trains of UPS trailers crossing the country.
Also, Bakersfield is a major rail gateway to and from the LA basin.
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I've seen that one before. IIRC, it doesn't necessarily mean your package was on the derailed train, just that a derailment has occurred and is delaying that line.
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