If they make a super-sonic train, will they give it a whistle?

Gnomon

The supersonic train would need a whistle for the times when it is going at normal speeds. At supersonic speeds, the sound of the whistle would not travel forwards in front of the train. A more sensible arrangement would be to have a number of warning sirens positioned along the track and activated in advance of the arrival of the train. Jul 09 02, 7:14 AM

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