Kunming–Haiphong Railway

Yunnan–Haiphong railway  or Yunnan–Vietnam Railway (Chinese: 滇越铁路; pinyin: Dian–Yue tielu; Vietnamese: tuyến đường sắt Hải Phòng – Vân Nam/ 綫塘鐵海防－雲南; French: Chemins de Fer de L’Indo-Chine et du Yunnan, “Indo-China–Yunnan Railroad”) is an 855 km (531 mi) railway built by France during 1904–1910, connecting Haiphong, Vietnam with Kunming, Yunnan province, China. The section within China from Kunming to Hekou is known as the Kunming–Hekou railway (Chinese: 昆河铁路; pinyin: Kun–He tielu), and is 466 km long. The section within Vietnam is 389 km (242 mi) long, and is known as the Hanoi–Lào Cai railway (Vietnamese: Đường sắt Hà Nội – Lào Cai/ 塘鐵河内－老街). The railway was built with 1,000 mm (3 ft 3 ³⁄₈ in) gauge due to the mountainous terrain along the route. Currently it is the only main line in China using 1,000 mm (3 ft 3 ³⁄₈ in) metre gauge.