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 Part of the problem is that several have responded to my question as if I am merely asking about “foggy” conditions where things might only be a little hazy.  They demonstrate this interpretation of my question when they say that fog is no different than curves or running at night.    But I am asking about fog so thick that an engineer is completely blinded by it.  So there is a great deal of difference between that visual impairment and the visual restriction of a curve.    And yet others have declared than no amount of visual impairment requires an engineer to slow down, so they apparently understand my question is predicated on zero visibility.  Indeed it has been suggested that trains can run blind just like airplanes flying on instruments with no line of sight guidance.
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