2 ft 6 in (762 mm) gauge railways are narrow gauge railways with track gauge of 2 ft 6 in (762 mm). This type of rail was promoted especially in the colonies of the British Empire during the second half of the nineteenth century by Thomas Hall and Everard Calthrop.

Several Bosnian-gauge railways with 760 mm (2 ft 5+15⁄16 in) are found in south-eastern Europe. 760 mm (29.92 in) is well within tolerances of 762 mm (30.00 in).