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They are a good idea especially if you cannot see all your track . Downside is that this is normally not feasible on a large scale  on the grounds of cost or practicality.   <A href="http://www.gatewaynmra.org/detection1.htm">http://www.gatewaynmra.org/detection1.htm</A> <A href="http://www.digitrax.com/menu_detectionsignaling.php">http://www.digitrax.com/menu_detectionsignaling.php</A>   optical detection is unlikely to function well outside and current detection is only ok if you own a cable manufacturing company. Would be a real challange i suspect
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