在1990年到1998年间，公路运输增加了19.4%，而同期铁路货运量下降了43.5%。
Between 1990 and 1998, road haulage increased by 19.4%, while during the same period rail haulage decreased by 43.5%.
通过对近年全国铁路货运量的统计数据进行分析，运用灰色理论建立了铁路货运量预测模型。
After analyzing the data on railway freight volume of recent years, the authors establish the railway freight volume forecasting model by use of grey theory.
并提出在利用人工神经网络进行铁路货运量预测时，训练样本的时间长度为最近的一个完整经济周期。
Meanwhile, the length of time on training sample was determined as the recent complete economic cycle when using artificial neural network for railway freight volume forecasting.
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