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Nathan K5LA Train Horn Doppler Effect

Doppler effect from a well used set of K5LAs probably manufactured in the mid seventies. My buddy has had them mounted on numerous road tractors since he bought them in 1996. Before mounting them on his newest truck he let me borrow them to play around with for a couple of months. Train horn aficionados may notice they sound a little muted due to the fact that they are firing into the tailgate of my pickup as opposed to being free to directly disperse into the surrounding air or pavement. 18 gallons of air at 125 psi yields about 8 seconds of steady pitch and volume. I have a few pics of the horns on Flickr: