Posted by larrym on March 8, 2010 
Considering the neighborhoods IHB rolls through,I would guess the third eye is either a missle launcher or a machine gun for crew protection
Posted by Joseph LeMay on March 9, 2010 
I remember reading somewhere that it is a camera for added safety in switching moves. They are also mounted on the rear and there must be a small monitor in the cab for the engineer to see.
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