Why does fog put brakes on fast running trains even in rain, sunshine and extreme heat?

Trains often get late in winter. Many times, many trains are canceled by the Railways to ensure timely delivery of essential trains. Last November itself, Northern Railway had canceled 62 trains as a precautionary measure. There were 46 trains whose journey was reduced. Apart from this, there were some trains which were decided to run less than the prescribed distance. Railways often do this during winter, but have you ever wondered why even so many efforts of the Railways prove unsuccessful in dealing with fog. If not then let us…

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