The gauge for the most of the China national railway network is standard gauge. Currently, in the national railway network, only the 1,000 mm (3 ft 3+3⁄8 in) metre gauge Kunming–Hai Phong Railway uses narrow gauge. In addition, there are some industrial lines still using narrow gauge, mostly 2 ft 6 in (762 mm) narrow gauge or 600 mm (1 ft 11+5⁄8 in) narrow gauge. As of 2003, 600+ km narrow-gauge railways, 50000+ km standard gauge railways, and 9.4 km broad gauge railways were in use in mainland China.