I found this oldish article on essentially the efficiency of transport, with respect to speed, at http://www.ingenia.org.uk/ingenia/is...2/imperial.pdf
An easier to read text-only version is at http://www.ingenia.org.uk/ingenia/ar...aspx?Index=305 but the pdf is needed for the figures.
The following chart is quite an eye-opener and merits ten minutes of study
An easier to read text-only version is at http://www.ingenia.org.uk/ingenia/ar...aspx?Index=305 but the pdf is needed for the figures.
The following chart is quite an eye-opener and merits ten minutes of study
![](http://img823.imageshack.us/img823/3170/20111121134126.gif)
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