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Electric, Train Speed Regulator 9V Power Adapter 230V 50Hz (Continental European) : Part 70928 | BrickLink
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LEGO Blue Electric Train Speed Regulator 12V Power Adaptor for 220V 50 Hz Type II | Brick Owl - LEGO Marketplace
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LEGO Set KTR04-1 Large Classic Train Kit with Speed Regulator (2003 Train > 9V) | Rebrickable - Build with LEGO
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