This signal is located at the Steeles Avenue crossing at Milliken GO station, it is a part of the CROR signal rules but I don't know what it does. It never lights up, and unlike most one headed signals it does not have a R plate n the bottom for restricting. What does it do? And this signal appears to be only able to show one colour. If I need it for my route I won't understand it. I don't think it is deactivated as most deactivated signals have their heads facing to the left or the right.
Here it is for reference.
Here it is for reference.