This is a Tomar H861 triple head mast, these come fitted with bi-colour LED's that I remove and replaced with RRCirKits - Tri-Coloured LED's, these provide the true railroad aspect colours of red, yellow & green.
The true aspect colours from the RRCirKits LED's can really be seen well in this photo, no more blowing signals with operators because they look similar now...
The the mainline ahead is routed into track 2 at Shippensburg hence the Approach Medium (Yellow, Green, Red - Aspect), the signal ahead is displaying Medium Approach Medium (Red, Yellow, Green - Aspect).
The addition of operating signals on your layout is a big undertaking, can be costly and time consuming. But when operating and automated like this brings a whole new experience to operations on your layout...
Jas.