The original high-speed train c.1938

This video show the awesome Mallard steam locomotive that holds the world speed record of 125mph for a passenger train powered by steam.  Modern electric locos only go about 50% faster than this which is not much considering the Mallard ran on old fashioned rails with heavy, non-aerodynamic passenger cars whereas the lightweight, streamlined new electrics run on specially designed high-tech rails with special wheel designs. But look at the pollution from the smokestack! Electric power is best. Watch the Guiness world records clip here (Youtube)

Caroline