摘要
IntroductionBeing of great value to railway transport and hence to nationaleconomy,electrification of railways has been carried out very rapidlyin China in the past 30 years.By the end of 1990,some 6941 km ofelectrified railways have been opened to traffic and about 16,000 kmor one fourth of the total railway length are expected to be electrified,accounting for 45% of the total railway freight volume.At present,Shaanxi Province ranks first with respect to
