Very nice Chris. Whenever possible I also strive for no "umbilical cord" between chassis and the shell light installs. How feasible would it be doing alternating ditch lights with this type of install?
It can be done. In fact, I have done it with a SD70ACe that I converted to a Next18 ESU decoder a year ago (just before ESU announced the direct decoder...). Obviously you need two LED for the ditchlights and you need to split the light tubes lengthwise to separate the ditchlights.
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LED on the front of the board for independent ditchlights
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Light tube separated from the headlights by black tape, then shortened and split lengthwise, with a black tape strip in between to avoid light bleed between the two ditchlights. This strip extends into the slot between the LEDs on the board.