1. 
   Track & Signal
   Track & Signal is a railroad related periodical published in Australia. It covers the operating and equipment industries. == Predecessors == The magazine was previously called Railways of Australia Network and was published by the Railways of Australia Committee. Network was published at least as l...
   Found op http://en.wikipedia.org/wiki/Track_&_Signal
   
   
2. 
   Track Signal
   The signal sent to or coming back from one track of a multitrack tape recorder.
   Found op http://www.testing1212.co.uk/a.htm
   
   
3. 
   Tracking signal
   In statistics and management science, a tracking signal signal monitors any forecasts that have been made in comparison with actuals, and warns when there are unexpected departures of the outcomes from the forecasts. Forecasts can relates to sales, inventory, or anything pertaining to an organizati...
   Found op http://en.wikipedia.org/wiki/Tracking_signal
   
   

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