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There seems to be agreement here that the two conditions for running track speed in visibility-restricting fog are: <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p> 1)        The engineer must have track authority. 2)        The engineer must know where he is at on the rail line. <o:p></o:p> <o:p></o:p> In my mind, there are some unresolved issues with item #2.  In a way, it sounds rather absolute and clear cut, but when you dissect it, there are many possible interpretations of “knowing where you are at” on the railroad.    Certainly, under normal conditions, visual cues are a big part of providing awareness of location.  Fog is capable of completely eliminating visual cues.  Therefore, it leaves this question:  Is it possible or permissible for an engineer to know where he is at on the railroad even if he cannot see past the cab windows?     <o:p></o:p> Some engineers may have enough experience to know where they are at on a run, even if they were blindfolded.  But if an engineer possessed that level of familiarity with the road, how would the company know that for certain, in order to permit blind running in fog?  Would it not be necessary to test all engineers to see if they possessed the ability to run blind while knowing where they were at on the railroad? <o:p></o:p> Many engineers will have the familiarity with their line that will enable them to know where they are at, even though deprived of sight, but such knowing may often not be continuous.  There are likely to be some lapses of recognition between the familiar mental landmarks.   So, I would like a specific definition of what satisfies the requirement to know where you are at on the railroad line.  The railroads must certainly have a rule that clarifies what it means to know where you are at when running a train.  What is the language of that rule?
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