Relativity: “Relativity teaches us the connection between the different descriptions of one and the same reality.” ~ Albert Einstein

The absolute weight of the rail doesn't matter. How heavy it is depends on what I lift it with and how long I work at it. If I lift it with a tool or machine it's not all that heavy. If I try to lift it with 'manpower' only, then it becomes another issue. If I have to work at lifting it for an hour it becomes much heavier, and I'll have an ache in my back. If I work at it for several hours someone may have to call an ambulance. In each case it's the same weight, but the tool I use and the longer I work at it determines how heavy it is."

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