Hello all!   
      
   I live near a Kansas City Southern line.  It is operated by train   
   order, and the dispatchers often set up meets between eastbound and   
   westbound trains in the next town east of me, which has a long siding.   
      
   I can always hear the dispatcher, and I can sometimes hear the two   
   train crews talking to each other at the meet.  I didn't notice the   
   correlation until recently, but when there is a meet set up, I can   
   sometimes hear six DTMF tones on the same channel they use for voice,   
   at about the time that one of the trains should be arriving.  Sometimes   
   these six tones are shortly followed by one single-frequency tone.  Are   
   these tones possibly operating the switches at the siding?  (My guess   
   is that the six tones tell a particular switch to operate, and the   
   single tone is a confirmation back from the switch.)   
      
   I haven't ever watched a meet, so I don't know if somebody gets off the   
   train to throw the switches or not - these tones could have nothing to   
   do with switching.   
      
   Thanks!   
      
   Matt Roberds   
      
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