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    OO Gauge Train sets

    OO gauge is the most popular model railway scale in the UK, built to a ratio of 1:76. HO scale, at 1:87, is the most widely used worldwide, especially in the US and Europe.
    Both scales share the same 16.5 mm track gauge, which is why many track systems are sold as “OO/HO.” The difference lies in the trains: OO models are slightly larger, while HO models are smaller and more space‑efficient