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Hornby Dublo 3 rail.

Hornby, then owned by Meccano, produced its first OO scale trains in 1938. These trains were of diecast metal, and tinplate. The trains used a 3 rail system on a metal base, with the voltage being 12 V DC.

It was not until 1959 that Hornby produced its first 2 rail model. Production of 3 rail models continued until 1964.

It was Hornby who introduce the OO gauge as they wanted more space for a motor than that available in an HO engine, but they kept the same track size.

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