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How to Install a DCC Decoder in a HO Steam Locomotive (Beginner‑Friendly) New to DCC? This quick guide walks you through planning, wiring, testing, and installing a decoder in a HO steam locomotive—using parts and tools we trust at Midwest Model RR. What You’ll Need Suitable DCC decoder (check plug type and current draw) Fine‑tip soldering iron & supplies Heat‑shrink tubing, Kapton tape, multimeter DCC system for programming and testing Example: SoundTraxx MC1H104P21 21‑pin d …