沈阳铁路局从1962年开始,在苏抚线和长大线铺设钢筋混凝土轨枕。到1979年底,先后共铺设1594.9公里,258万多根。 由于我局管内最低气温在-25.1℃～-38.7℃之间,所以冬季线路上普遍有冻害发生,一般在线路大修完成后,随着道床不洁程度的不断增加,线路表面的冻害也逐年增加。 Since 1962, Shenyang Railway Bureau has laid reinforced concrete sleepers on the Su-Fu Line and Chang-Da Line. By the end of 1979, 1594.9 kilometers and over 2.58 million were laid. As the minimum temperature in the tube of our bureau is between -25.1 ℃ and -38.7 ℃, frost damage occurs on the winter line generally. After the overhaul of the line is completed, with the increasing of the unpleasantness of the track bed, frost damage on the line surface also increases year by year .