我国于1951年开始在铁路专用线下采煤,1956年扩展到支线。在伟大的无产阶级文化大革命中又开始了在干线下的采煤试验。二十余年来,在毛主席的无产阶级革命路线指引下,路、矿协作,各矿区在铁路下开采出了大量被压煤炭,支援了社会主义建设,为我国的老矿挖潜,充分利 Our country began mining coal under the special railway line in 1951 and extended to the branch line in 1956. In the great Great Proletarian Cultural Revolution in the trunk again started the coal test. For more than 20 years, under the guidance of Chairman Mao’s proletarian revolutionary line, roads and mines have co-operated with mine areas to mine a large amount of coal under pressure so as to support the socialist construction and tap the potential of the old mines in our country.