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我国电气化铁路已达12757公里。郑州局管内有京广、陇海、宝成、襄渝、太焦线等电气化铁路3513.7公里,占郑州局管内线路总长度的半数以上。在1998年10月1日的新图中,电气化铁路均留有50～90分钟的接触网检修“天窗”。国外,由于行车密度小,一些高速客运专线大多采用白天行车,夜间开“天窗”维修方式,对行车影响不大。而我国铁路线大都是客、货混线运行运输方式,客车提速、货车重载,行车密度大,开“天窗”维修对行车干扰较为严重。随着客车对数的增加和重载列车的开行,对线路、信号、供电等各专业的维修工作
China’s electrified railway has reached 12,757 km. There are 3513.7 kilometers electrified railways such as Beijing-Guangzhou, Longhai, Baocheng, Xiangyu and Tai Jiao Line in Zhengzhou Bureau, accounting for more than half of the total length of lines in Zhengzhou Bureau. In the new map of October 1, 1998, the electrified railway has a 50-90 minute overhaul “skylight”. In foreign countries, due to the low driving density, some high-speed passenger dedicated lines mostly use daytime driving and nighttime open skylight maintenance methods, which have little effect on driving. However, most of the railway lines in China are passenger and cargo mixed mode of operation and transport, bus speeding, heavy truck, driving density, open “skylight ” maintenance of the traffic is more serious interference. With the increase of passenger car logarithm and the opening of heavy-haul trains, the professional maintenance work on lines, signals, power supply and so on