I finally got the chance to record the horn from "Silver Streak" and run it 
through a spectral analysis program.  I used the first occurance of the horn, 
when Charles Starett is sitting in the cab with the pilot, since there was no 
background noise.
The fundamental notes are F#5-A#5-D6.  The actual tones are 727, 930 and 1159 
Hz.  There are smaller peaks at 428(A4), 2086(C7), 2180(C#7) and 2313 Hz(D7).  
428 is the beat frequency of 1159-727, 2086 is the beat frequency of 1159+930 
and 2313 is the first harmonic of 1159.  I can't account for 2180, so it might 
be a real note.
I still think that the "horn" sounds more like an air-blown whistle than a real 
horn, but on our cheap Yamaha keyboard set to Trumpet voice, F#5-A#5-D6 gives a 
pretty good representation of the horn.
Best regards,
Randy
 
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