What Is This???

What Is This???
I found this device on the CN Main on their L'Anse Sub. Does anyone know what it is? And what its used for???
Date: 5/30/2012	Location: Diorite, MI	Views: 192	Collection Of: steven langsford
			Author: steven langsford

Picture Categories: Track		This picture is part of album: Interesting Rail Shots & Other RR Iteams

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Name	Type	Comments	Date

David Saxby Jr	General	It could be a wash-out detector. Missing ballast causes the unit to give an occupied block to the signaling system	6/12/2012 8:32:20 PM

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