Behind The Horse’s Ass

Here’s another good one for the E-Mail Funnies volume:

Just in case you didn’t know this.

Railroad tracks. 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 English expatriates designed the US railroads.

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 had used for building wagons, which used that 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 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? Imperial Rome built the first long distance roads in Europe (including England) for their legions. Those roads have been used ever since. And the ruts in the roads? Roman war chariots formed the initial ruts, which everyone else had to match for fear 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. In other words, 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.

Now, the twist to the story:

When you see a Space Shuttle sitting on its launch pad, you will notice that 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 larger, 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 horse’s 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?

It appears that Horse’s Asses determine almost everything …

That explains a lot, doesn’t it?

I want ice water.

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14 thoughts on “Behind The Horse’s Ass

  1. Sure gives new insights into the difficulties behind structural upgrades, whether it be physical, like railroads and sewer systems, or intellectual, like Windows and the Internet! πŸ˜€


  2. That was a totaly cool bit of info. I love railroad tracks. I’ll have new thoughts in my head next time I see one. Chariot wheels… So Cool! but wait… ruts suck even for cars. What kind of dangerous feat must it have been to run a horse between ruts? If the horse spooks? Bumpety, bump, crash,crack! How hard would it be to look like a regal conquerer while flying through the air. Im picturing true Monty Python.


  3. that’s a good article! I like the little demolitions at the tunnel entrance … – in Germany we have a saying: “Who cannot hear (following the rules) must feel (some pain, hitting a tunnel’s roof)


  4. Good post. Clever, insightful and amusingly told.

    As an engineer I can tell you that you are on the right track. For all its reliance on science history shows that engineering has always been a process of cut and try, punctuated by calamities.


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