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In this #tutorial I explain how to install direction-dependent #train tail lighting in an #H0 #1:87 carriage. The necessary circuit with a bistable relay is described in detail. This video is intended to inspire you to recreate it. Enjoy watching. Shopping list: 1 x bistable relay 5V (1 coil, 1 changer) 1 x bridge rectifier 1A 2 x diodes 2 x LED 3mm red 1 x resistor 6.9kOhm Interior lighting: 1 x LED strip warm white (12V) 1 x resistor 1kOhm 1 x resistor 3.9kOhm 1 x capacitor 100µF 1 x diode Wire and cable The circuit works for all digital systems (m4, #mfx, #DCC, #Motorola,...) and analogue systems (alternating current). This circuit does not only work for carriages from the #Märklin / #Trix range.