根据铁道部1983年制定的铁路主要技术政策,“自动闭塞区段,在安排运行图时,应开天窗予留养路作业时间”。1984年初“开天窗”维修列入国家科技攻关项目“铁路重载列车成套技术研究”中,1984年7月1日,我们北京局石家庄分局首先在石太线石-阳段试验双线电气化铁路“Ⅴ型综合维修夭窗”。 According to the major railway technical policies formulated by the Ministry of Railways in 1983, “automatic block sections should be opened with skylights to keep road maintenance hours when arranging the operation plans.” In early 1984, “open skylight” maintenance included in the national scientific and technological project “complete sets of railway technology research”, July 1, 1984, our Beijing Bureau Shijiazhuang Branch first in the stone line - Yang test two-lane electrified railway “ Ⅴ type integrated repair window. ”