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My thought would be, and this is only a thought. The ice sticking on the ties forms a conductor across the rail bed. This shorts out the two rails causeing signaling circuits to activate. My guess is, there is some kind of Zeaner Diode or current switch in the signal boxes that stops this from happening in normal rainy weather. But with ice (With lease resistance then running water) forming a direct short across the rails, the signals see it as a short caused by a train. <br /> Just Guessing <br /> TIM A
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