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rgraham666 said:The design of one of the most modern means of transportation is limited by one of the oldest.
In Roman times, roads were built to handle carts of a particular size wheel base.
Road builders continued to use this standard. When railroads were introduced, the gauge of the rails was set to these ancient road standards.
When people designed the boosters for the space shuttle, they knew they were going to be shipped by rail.
So the boosters were limited in size by the rail gauge which was set in Roman times.