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Wabash, I completely understand your points on running a train by feel, without the use of eyesight.  You mentioned that anybody can learn to do their job blindfolded.  I suppose that it true.  And my basic question goes to running in that 100% zero-visibility fog that persists for significant distances.   <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p> But you also gave several examples of relying on landmarks near the track, seeing out the side window, etc., so this suggests you are responding to a question about fog that offers at least some visibility.  So it seems like I am talking about zero-visibility fog, while you and maybe others, are talking about the more common foggy conditions that most of us have experienced where the fog interferes with visibility, but does not eliminate it.    But, in any case, I suppose that from a practical perspective, the chance of zero-visibility fog lasting long enough for an engineer to lose track of his location is so small that you could almost say it never happens.  Such fog would probably have to last at least ten miles before an engineer might lose track of his location.  And even to get to zero-visibility, the fog might have to be combined with smoke, which would make it an even rarer occurrence.
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