WHISTLE FREQUENCIES
Last Update:  March 20, 1998

I love the sound of a steam whistle echoing off the canyon walls after a day out on the line.  I have often wondered what tones are coming out of the whistles of the K class engines.  A while back I used to work for a company that was involved in noise cancellation equipment and had access to a spectrum analyzer.  I took some of my video tapes in to work and made some plots of the various engines.  The results can be seen in the following charts.  I can't really vouch for the accuracy of the charts but they seem to make sense due to the fact that most of the whistles were 5 chime devices.  I have included some audio files for your listening pleasure.  They are all Real Audio files so you will need the Real Player.

Get the Real Player now:  www.real.com


FREQUENCY PLOT OF CUMBRES & TOLTEC #487


FREQUENCY PLOT OF CUMBRES & TOLTEC #488


FREQUENCY PLOT OF DURANGO & SILVERTON #482

 Hear 482 whistle



REAL AUDIO FILES

     Bell K36 #484
     Double header whistle #463 & #497
     Whistle K27 #463
     Whistle K36 #489
     Whistle K37 #497



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