762mm

762 millimeters, equal to 30 inches, is a rail gauge used for narrow-gauge railway systems. As a narrow gauge, it is smaller than standard gauge (1,435 mm) and falls into a category chosen for lower construction costs, tighter curvature, and lighter infrastructure. The 762 mm gauge is sometimes referred to as 30-inch gauge in certain regions.

Historically, 762 mm has been adopted for various industrial and priority-use railways, including mining, quarrying, forestry, and other industrial applications where heavy loads and long hauls were less critical than maneuverability and cost. It has also appeared on some early passenger and light railway lines and in heritage or tourist railways that seek to preserve older operating practices. Because of its smaller footprint, this gauge can traverse steeper grades and tighter curves than standard gauge, making it suitable for confined landscapes such as mines or forest areas.

In contemporary use, 762 mm gauge is most commonly found on heritage, tourist, or industrial lines rather than new mainline networks. While it remains part of the broader family of narrow-gauge railways, most active 762 mm routes today are operated for historical, educational, or recreational purposes. The gauge continues to play a role in regional rail systems where special requirements favor its compact dimensions, though its practical footprint is smaller and more specialized than wider gauges.