This set was a specialized "Service Pack" designed to extend the 9V electric system used in LEGO Trains and Space themes from the late 80s.
: Unlike standard plastic bricks, these contain metal and should never be washed in water, as this will cause corrosion. 4. Digital Resources Set 5037zip
: These bricks are only compatible with the LEGO 9V Electric System and will not work with modern "Power Functions" or "Powered Up" systems without custom adapters. 2. How to Use Current-Carrying Bricks This set was a specialized "Service Pack" designed
: Electricity flows through the metal strips. Ensure your plates are oriented so the "positive" and "negative" lines aren't crossed or shorted by a non-conductive standard brick. Set 5037zip