1 x HO scale model railroad cantilever grade crossing signal no track sign #C08 the black wire is Common

the black wire is Common Anode wire

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they can be lighted automatically when  a train pass by and the signals will flash alternatively

1 x HO scale model railroad cantilever grade crossing signal no track sign #C08 the black wire is CommonStore Home New Arrival Ending Soon Add to Favorites View Feedback Contact us Store Categories USA store HO Scale OO scale O Scale N Scale Light Emitting Diode LEDs Grain of Wheat Bulbs Wholesale Buy In Bulks Switches Connectors G Scale Z Scale Electronic Component Resistors Nintendo DS Nintendo GBA SP UK store HO gauge OO gauge O gauge Light Emitting Diode LEDs N gauge Switches Connectors Grain of Wheat Bulbs Wholesale Buy In Bulks G gauge Z gauge