The paper hence suggested that to achieve transportation task for year 2000, China rail way should actively increase in traindensity while raising traction load of trains.
提出为完成2000年的运输任务，今后在大力增加列车牵引重量的同时，还应积极加大列车密度。
2
Use medium density mirror can let you filming the train speed and waterfall of silk best effect.
使用中密度镜可以让你拍摄火车飞驰和瀑布丝质般的最佳效果。
3
The paper expounds the transportation load of China railways, and reviewed the position and role of increasing train operation density in raising transport capacity.