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?
Well, because that’s the way they built them in England, and English engineers designed the first US railroads.
• Why did the English build them like that?
Because the first rail lines were built by the same people who built the wagon tramways, and that’s the gauge they used.
• So, why did ‘they’ use that gauge then?
Because the people who built the tramways used the same jigs and tools that they had used for building wagons, which used that same wheel spacing.
• Why did the wagons have that particular odd wheel spacing?
Well, if they tried to use any other spacing, the wagon wheels would break more often on some of the old, long distance roads in England. You see, that’s the spacing of the wheel ruts.
• So, who built those old rutted roads?
Imperial Rome built the first long distance roads in Europe (including England ) for their legions. Those roads have been used ever since.
• And what about the ruts in the roads?
Roman war chariots formed the initial ruts, which everyone else had to match or run the risk of destroying their wagon wheels. Since the chariots were made for Imperial Rome, they were all alike in the matter of wheel spacing. Therefore, the United States standard railroad gauge of 4 feet, 8.5 inches, is derived from the original specifications for an Imperial Roman war chariot.
• Bureaucracies live forever.
So the next time you are handed a specification/procedure/process and wonder ‘What horse’s ass came up with this?,’ you may be exactly right.
Imperial Roman army chariots were made just wide enough to accommodate the rear ends of two war horses. (Two horses’ asses.)
• Now, the twist to the story:
When you 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 in Utah.
The engineers who designed the SRBs would 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 happens to run through a tunnel in the mountains, and the SRBs had to fit through that tunnel. The tunnel is slightly wider than the railroad track, and the railroad track, as you now know, is about as wide as two horses’ behinds.
So, a major Space Shuttle 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.
And you thought being a horse’s ass wasn’t important? Ancient horse’s asses control almost everything.
-Dr. Joerg Storm
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CINDY LEAL MASSEY, TEXAS AUTHOR
Clever Journeys 
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I’d like to hear you tell that story with a straight face.
“Why do we do it this way?’ “I don’t know, that’s just the way we’ve always done it.”
It’s like my road in mud season. Everyone gets caught in the same ruts, afraid of going off to the side and the ditch. So the ruts get deeper, and you can get stuck. A risk-taker aims for the sides to create a new path, which compresses the ruts. You swerve more, but you make a better way through. Unless you hit the ditch. Then you call your neighbor with the truck and tow chain. You, know, just yesterday, I was wondering if anyone ever deviated from the standard train width. This is wild.
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Serendipity.
I have wondered how many of the roads we traveling started out as a rabbit or deal trail.
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P.S. This means that for about 260 years, since when they used horse and wagons, the same ruts, in the same places, have been being grooved into this road. Before that, it was a First Nation trail for getting to the hunting grounds on the ridge. They walked. No ruts.
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A supervisor from work used to comment that a giraffe is an attempt by engineers to design a horse. Of course it’s a joke, but it showed his frustration with engineers. Snopes lists the story of Railroad Gauge, essentially, as true, but claims it was just a coincidence. I don’t trust Snopes, just saw it in the search results.
Small Roads in Western Pennsylvania tend to follow creeks, and creeks are not known for being straight. Why would they follow the creek? Crazy world of strangely engineered things.
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