The N scale has gained significant popularity in the world of model railways. This scale, which can range from 1:148 to 1:160 depending on the manufacturer or country, is commonly regarded as 1:159 for practical purposes. The corresponding width is 9 mm to 1,435 mm (4 ft 8 1/2 in), reflecting the standard gauge width of a railway.

The HO scale is the most popular choice for model railways worldwide. It uses a 1:87 scale ratio, making it a great option for creating detailed and realistic models. The distance between the rails in HO scale is 16.5 millimeters, which corresponds to the standard gauge of 1,435 millimeters.

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

The O Scale (1:48) is a widely known and well-established scale within the industry, renowned for its extensive range of top-notch trains and accessories. With its larger size compared to HO scale trains, O scale trains offer a multitude of impressive features and exceptional attention to detail. Noteworthy manufacturers in the O scale market include Lionel, MTH, Atlas, and Williams, among many others.