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In an earlier post, I used the term visibility-reducing fog which leaves the door open to fog that is somewhat obscuring, but not that difficult to see the key details when knowing the road.  But I misspoke since I did not intend confuse the issue by considering the various degrees of fog.   So, just to be clear, I am asking about the definition of “knowing the road” when you cannot see past the cab windows.  I am talking about zero-visibility.  And for practical purposes, some of how this is addressed might extend into situations where visibility is not zero, but close to zero.  But for purpose of discussion, let's start with zero. <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p> Now some engineers might be able to know the road in such zero-visibility.  But when it is expected that engineers know the road, I doubt that this automatically assumes that they can adequately know the road without the use of eyesight.  Knowing the road without eyesight would be far more difficult than knowing the road with eyesight.    In zero-visibility, knowing where you are at on the railroad would be vitally critical when running at track speed.  I can’t believe that an organization as safety-minded as the railroads would simply allow engineers to declare they know the road and can therefore run at track speed in cases where fog removes all visual cues.
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