The Hornby Railways Zero 1 R951 Slave Control Unit is a model train speed controller designed for OO gauge model railroads. This AC-powered control unit is part of the Hornby brand's Zero 1 system, allowing for precise control of train speeds on the tracks. The unit comes boxed, indicating that it is likely in good condition and well-preserved for collectors or hobbyists looking to expand their model railroad setup with additional control capabilities.
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