Harold R. Magnuson Wrote:
-------------------------------------------------------
> From the report:
>
> Contributing to the accident was the Canadian
> National Railway’s use of after-arrival track
> authorities in nonsignaled territory, a procedure
> that is vulnerable to human error and lacks
> inherent safety redundancies ensuring consistent
> safe operation.
>
> ~~~~~~~~~~~~~~~~
>
> Short of returning to timetable and train order
> authority, or requiring all track to be signaled,
> what alternatives are there?

Timetable and train order operation is much more complicated than even "after-arrival" track warrants. There is a much greater possibility of crew error unless train orders are issued like track warrants specifying each meet. That would be the same as track warrants used today without the "after-arrival". Track warrants used that way are the same as CTC with the paper replacing signal indications. Human error to ignore a signal or a piece of paper remains in CTC or track warrants.