The term "30-inch railways" typically refers to narrow-gauge railways that have a track gauge of 30 inches (approximately 76.2 cm). Narrow-gauge railways are often used in mountainous areas or for industrial purposes where tighter curves and steeper gradients can be accommodated compared to standard gauge railways.
The 7mm Narrow Gauge Association (7mm NGA) is an organization that promotes the interests of modelers and enthusiasts who focus on narrow-gauge railway modeling in a 7mm scale. The association typically caters to those interested in modeling railways that are not standard gauge, often representing smaller, less common railways that operated in various parts of the world.
HOn30 is a model railroad scale that represents a narrow gauge railway system. In this scale, the "H" stands for "HO" scale, which is 1:87 scale (1 inch on the model represents 87 inches in reality), while "n30" indicates that it models railways that have a track gauge of 30 inches.
OO9 is a term often associated with a specific scale used in model railroading, specifically for narrow-gauge railways. The "OO" typically refers to the gauge of the track, which is 16.5 mm (0.65 inches) between the rails, but "OO9" specifically refers to a smaller gauge of 9 mm for narrow-gauge trains.
On30 is a model railway scale and gauge that represents a narrow-gauge railway system. Specifically, "On30" refers to O scale trains running on a track gauge of 30 inches (762 mm), which is typical for narrow-gauge railroads. In model railroading, O scale generally has a scale ratio of 1:48, meaning that 1 inch in the model represents 48 inches in real life.
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