The Dwarvin Integrated Crossing Signal Kit from provides all that you needto integrate two railroad crossings together with two side-on detectors andone crossing bell, all controlled by the Lamplighter The detectors are ofthe pulsed infrared kind so they are insensitive to the ambient lighting.They stay on as long as they \”see\” an object. The DFL unit, in turn, turnsoff five seconds after all detectors return to their waiting state. Thereis no programming or soldering required. The three wires from the detectorsand crossing bell are attached to the control unit using screws built intothe control unit. The fiber optics are inserted into two \”chimneys\”. Eachcan hold either a 1.0mm fiber for the HO Scale crossings or 0.75mm fiberfor the N Scale crossings, or 1.5mm fibers for O Scale. Integrated CrossingSignal Kits are supplied with or without power supply. They can also bepowered from your layout bus with center-positive wiring into the powerjack connector provided in the kit. Note: Each track must have its own setof detectors for the crossing signals to function. The Dwarvin IntegratedCrossing Signal Kit is one of many fiber optic lighting and signalingproducts from Dwarvin.