Fibre Optic type shunt signal WHC 2666

In contrast with the previous picture, this displays the newer type of electrically displayed signal , rather than the older mechanical type.  It's function is identical.
Above the signal is a Rail Gap Indicator, and below the unique signal plate.
Just visible to the left is a metal pipe which carries the air supply for operating equipment such as train stops and point motors - the cock (tap handle) in the vertical position can be used to isolate the air supply.