Japanese National Railways

The Japanese National Railways (日本国有鉄道, Nihon Kokuyū Tetsudō or Nippon Kokuyū Tetsudō), abbreviated JNR or Kokutetsu (国鉄), was the government-owned entity that operated Japan's national railway network from 1949 to 1987. == Network == === Railways === As of June 1, 1949, the date of establishment of JNR, it operated 19,756.8 km (12,276.3 mi) of narrow gauge (1,067 mm (3 ft 6 in)) railways in all 46 prefectures of Japan.

Source: Wikipedia — Japanese National Railways (CC BY-SA 4.0)