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The SRB was designed to fit through a tunnel. The size of the tunnel was not chosen based of the gauge of the railroad. I'm not sure if this is satire.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.