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If you really want to get tricky. Put a cheap decoder in the engine just for lights. That decoder and your QSI decoder would get programmed to the same address. Then pick a function number not used on the engine and assign it to the lighting decoder to either turn on or oscillate the ditch lights. I dont know how feasable this is as i havent seen the inside of the BLI SD40-2. But if there is room...
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