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I used an Atlas 4 function decoder in mine.I added 1000 ohm resistors to every bulb and had no trouble.The shell on on the SD70 spartan is the hardest to get off.I had to end up removing the cab and battery boxes to get mine off.Seems like I found some glue or paint residue holding the tabs in place on the long hood.The SD70M is alot easier to remove.Lightly squeeze the long hood where the tabs go into the frame and it should pop loose.Watch the bulb wiring though.Dan
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