Some ancient cities had limits to the speed horses and chariots could move within those cities. Usually walking pace, which is about four mile per hour.
This was also the case in some countries when engine driven vehicles were introduced. Someone had to walk in front of the vehicle with a flag or lantern.
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As fast as the horse pulling it. The locomotive, powered by steam, does not get invented until the 19th century.
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Dr. Guillotin said that it was in "the twinkling of an eye".
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12-13 mph