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      Thanks!

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        To summarize: the link isn’t nearly as direct (tooling, etc) as the story portrays, but the basic flow - two horses' asses -> width of wagons -> width of roads -> width of railroads -> acceptable SRB width - is accurate. For those counting, SRBs for the shuttle were 12.17 feet in diameter, so much wider than a railroad gauge, but plausibly approaching the width of a tunnel, which is decided by the widest train car you could reasonably put on a 4' 8.5" track and still have it be stable. So an SSRB’s width is not the same as, but is dictated by, the width of two horses' asses. Also see loading gauges in the US: the maximum allowed width is usually 10' 8", so larger loads like the SRBs might require that hardware be scooted further away from the tracks.