No crews on trains
https://www.regulations.gov/document?D=FRA-2018-0027-0003 Railroads are implementing statutorily mandated positive train control technology (a processor-based/communications-based train control system) to prevent train accidents by automatically controlling train speeds and movements if a train operator fails to take appropriate action in certain operational scenarios. These various systems of automation and technologies have transformed rail operations in recent years, improving railroad operational safety and efficiency.
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Automation in the Railroad Industry https://www.regulations.gov/contentStreamer?documentId=FRA-2018-0027-0003&contentType=pdf