I wanted to add Working ground signals that were robust and cost effective for my OO gauge railway layout, these are the result. So I decided to make extras which might be of interest to other modellers. Made from brass, painted, with Working 3volt dc lamp and coloured lenses with piano wire control rod which is designed to be connected to a servo motor (not included). They require a 6.5mm hole through baseboard and have 4 holes that can be used with track pins (not included) or can be carefully glued in place (recommended). Price is for one signal. For peace of mind please read positive feedback for this item. Please see my other listings for single, double and triple ground shunt signals.