A Bing O gauge 0-4-0 Continental loco and tender black lined red no.3015, 3 rail AC electric with twin nickel plated domes and smokebox
- Gauge - The first model railways had a track width of 48mm (1.89 inches) which was named 1 gauge. With smaller key-wind locomotives a narrower gauge was introduced, call 0 gauge, and then in the early 20th century "half 0" (or HO) gauge was introduced. In Britain and the Commonwealth countries this was called "00" gauge.
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