The signal is wired as common cathode (negative), common anode (positive) can be provided if preferred.
25 N gauge colour light signals - Mainly CR signals
SN06 - CR Signals N Gauge 2 Aspect Home Signal with Safety Ring (Red / Green)
SN11 - CR Signals N Gauge 2 Aspect Home Signal with Safety Cage (Red / Green)
CR Signals SN08P N Gauge 3 Aspect Home Platform Colour Light Signal
CR Signals SN08P/35 N Gauge 3 Aspect Home Platform Colour Light Signal
SN08RI01 - CR Signals N Gauge 3 Aspect Home Signal with Safety Ring & Pos 1 RI
