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The 2 ft 6 in (762 mm) rail gauge is similar to 760 mm (2 ft 5 15⁄16 in) Bosnian gauge and 750 mm (2 ft 5 1⁄2 in) gauge. In the mid-to-late 1800s, this gauge was promoted by Thomas Hall and Everard Calthrop to reduce costs.
References
2 ft 6 in gauge railways Wikipedia(Text) CC BY-SA