What is the largest train gauge?

Broad gauge of 1,676 mm (5 ft 6 in), commonly known as Indian gauge, is the dominant track gauge in India, Pakistan, Bangladesh, Sri Lanka, Argentina, Chile, and on BART (Bay Area Rapid Transit) in the San Francisco Bay Area. This is the widest gauge in common use anywhere in the world.



The "largest" or widest train gauge currently in use for standard commercial rail in 2026 is the Indian Gauge (Broad Gauge), which measures 5 feet 6 inches (1,676 mm). This gauge is the standard for the vast majority of the rail networks in India, Pakistan, Argentina, and Chile. It is significantly wider than the "Standard Gauge" used in North America and much of Europe, which is 4 feet 8.5 inches (1,435 mm). However, even wider gauges have existed for specialized purposes; for example, the Russian Gauge is 5 feet (1,520 mm). Historically, the widest gauge ever implemented for a major project was the Brunel Gauge (7 feet or 2,140 mm) used by the Great Western Railway in the 19th century, though it was eventually converted to standard. In 2026, extremely wide "gauges" are still found in industrial settings, such as those for massive shipyard cranes or rocket transport platforms, which can span over 20 feet.

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Generally, the types of railway track gauges can be divided into the standard gauge, the narrow gauge, and the broad gauge. The most common gauge is standard gauge 1435mm (4 feet 8 1/2 inches). Gauges narrower than 1435mm are called narrow gauge while wider than 1435mm are called broad gauge.

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If locomotives were imported from elsewhere, especially in the early days, the track would be built to fit them. In some cases standard gauge was adopted, but many countries or companies chose a different gauge as their national gauge, either by governmental policy, or as a matter of individual choice.

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Broader gauge railways are generally more expensive to build, because they are usually heavier in construction, use larger cars and locomotives (larger loading gauge), as well as larger bridges, larger tunnels (larger structure gauge).

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Broad gauge of 1,676 mm (5 ft 6 in), commonly known as Indian gauge, is the dominant track gauge in India, Pakistan, Bangladesh, Sri Lanka, Argentina, Chile, and on BART (Bay Area Rapid Transit) in the San Francisco Bay Area. This is the widest gauge in common use anywhere in the world.

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Ukraine's railway network is in 1,520 mm gauge, which is prevalent in all post-Soviet countries, as well as in Russia.

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In the early days of railway modeling, some O scale modelers (the dominant scale at the time), made use of an outside third rail and a shoe pickup system for power. This system had the benefit of being more realistic by removing the central third rail common to O scale track, while retaining an effective power source.

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Germany has rail links with the following countries. All are to countries of the same gauge (1435 mm), although electrification (15 kV AC 16.7 Hz) and other systems such as signalling may differ.

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Japan's Shinkansen lines are all built to Standard Gauge, because trains are more stable, and can go faster, on wider track. Some other lines in Japan use 1,372 mm (4' 6”) or 762 mm (30”) gauge. But the majority, over 83% in terms of distance, of Japan's railways are built to Cape Gauge, 1,067 mm (3' 6”).

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