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The US standard railroad gauge (distance between the rails)is 4 feet, 8.5 inches. That's an exceedingly odd number.


Why was that gauge used?


Because that's the way they built them in England, and the US railroads were built by English expatriates.


Why did the English build them like that?


Because the first rail lines were built by the same people who built the pre-railroad tramways, and that's the gauge they used.


Why did they use that gauge then?


Because the people who built the tramways used the same jigs and tools that they used for building wagons, which used that wheel spacing.


Okay! Why did the wagons have that particular odd wheel spacing?


Well, if they tried to use any other spacing, the wagon wheels would break on some of the old, long distance roads in England, because that's the spacing of the wheel ruts.


So who built those old rutted roads?


The first long distance roads in Europe (and England) were built by Imperial Rome for their legions. The roads have been used ever since.


And the ruts in the roads?


The initial ruts, which everyone else had to match for fear of destroying
their wagon wheels, were first formed by Roman war chariots. Since the
chariots were made for (or by) Imperial Rome, they were all alike in the
matter of wheel spacing. The United States standard railroad gauge of 4
feet, 8.5 inches derives from the original specification for an Imperial
Roman war chariot.


Specifications and bureaucracies live forever.


So the next time you are handed a specification and wonder what horse's as* came up with it, you may be exactly right, because the Imperial Roman war chariots were made just wide enough to accommodate the back ends of two war horses. Thus, we have the answer to the original question.


Now the twist to the story..............


There's an interesting extension to the story about railroad gauges and
horses' behinds. When we see a Space Shuttle sitting on its launch pad,
there are two big booster rockets attached to the sides of the main fuel tank.


These are solid rocket boosters, or SRBs. The SRBs are made by Thiokol at
their factory at Utah. The engineers who designed the SRBs might have
preferred to make them a bit fatter, but the SRBs had to be shipped by
train from the factory to the launch site. The railroad line from the
factory had to run through a tunnel in the mountains. The SRBs had to fit
through that tunnel. The tunnel is slightly wider than the railroad
track, and the railroad track is about as wide as two horses' behinds.


So, the major design feature of what is arguably the world's most
advanced transportation system was determined over two thousand years ago by the width of a Horse's Ass!

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