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一、娄大段扩能技改工程的实践湘黔铁路从1975年元月正式运营后，运量迅速上升。到1985年，大龙口接入货运量就达到5.835Mt，按当时的列车牵引定数和列车对数计算，已达到极限能力，在超轴牵引1520t的基础上再提高蒸汽机车的牵引重量已经相当困难。在此情况下，铁路局决定在怀化至娄底间开行8对双机大列，以缓和湘黔线上行运量的压力。从当时的条件看，机车台数、车站到发线的有效长还不能满足开行8对大列的要求。分局于1986年3月成立了以总工程师为首的扩能小组，统筹湘黔线娄大段扩能技改工作。
First, Lou large section of energy-saving technological transformation project Xiangqian Railway from January 1975 formal operation, the volume increased rapidly. By 1985, Dalongkou access to freight reached 5.835Mt, according to the train number and train train at that time, has reached the limit capacity, in the over-axis traction 1520t basis to increase the steam locomotive traction weight has been quite difficult . Under such circumstances, the railway bureau decided to open eight pairs of double-decked large passenger trains between Huaihua and Loudi so as to ease the upward pressure on the Hunan-Guizhou line. From the conditions at the time, the number of locomotives, the effective length of the station to the hairline can not meet the requirements of the opening of eight pairs of columns. Branch in March 1986 set up a chief engineer-led expansion group, co-ordinate Xiangjiang line Lou large capacity expansion technical transformation work.