Price is for 1 complete4 heads Common Anode Railroad Crossing Signal with 2 tracks sign( without circuit board falshers )HO Scale with screw base for easy installation default common anode may inform me via the Paypal's note if you need common cathode signalCharacteristic Price is for 1 complete signal Size for each : please check from the photos for HO layouts Brand new PRODUCT DESCRIPTION you may click the following photo to buy the flasher circuit board:you may control them manuallyor Control them automatically by moving train ( cli...