Other than the sound increasing and deceasing on a prescribed route, I don't hear much of any doppler effect at all. I hear no difference in pitch coming at or going away like I expected on any of my MTH steam or diesels. When it was originally promoted, it stressed "...the Doppler Effect represents the change in pitch and volume that results from a shift in the frequency of the sound waves as evidenced by the sound of an approaching object. For example, as an ambulance approaches, the sound waves from its siren are compressed towards the observer. The intervals between waves diminish, which translates into an increase in frequency or pitch. As the ambulance recedes, the sound waves are stretched relative to the observer, causing the siren's pitch to decrease. By the change in pitch of the siren, you can determine if the ambulance is coming nearer or speeding away..." All I get is just sound volume going up then down.....how bout others?
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