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Railway track gauge in India is complicated by historical usage of multiple track gauges. Indian Railways uses four gauges: * Broad Gauge (BG), which is also called Indian gauge, * (MG), * Narrow Gauge (NG), and * Narrow Gauge. Project Unigauge that started in 1991 seeks to standardise the rail gauges in India by converting most of the MG and NG tracks to BG track. Some NG tracks on which heritage trains run in hilly regions to Shimla, Darjeeling, Ooty, Kangra will not be converted. Delhi Metro Rail Corporation constructed Standard Gauge (SG) in Delhi in 2010 and runs metro trains on of standard gauge in 2014. However, Delhi Metro is a separate urban mass rapid transit system not owned by Indian Railways. ==Overview== Broad Gauge is the most widely used rail gauge in India with approximately of track length and of route length in 2014. In some regions, Metre Gauge is common for historical reasons and consists of about of route length, down from more than in late 1970s. Narrow gauges are present on a few routes lying in hilly terrains and in some private railways because of cost considerations. Narrow gauges covered less than route length in 2014. Among the notable Mountain Railways of India, the Nilgiri Mountain Railway uses Metre Gauge whereas the Darjeeling Himalayan Railway, the Kalka-Shimla Railway, the Kangra Valley Railway, and the Matheran Hill Railway use Narrow Gauge. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Track gauge in India」の詳細全文を読む スポンサード リンク
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