在新建和改造编组站及货运站时事前需要对实际情况进行大量的调查研究。日本研究一种精确度较高的自动调查分析法。此法是在气球上安装电视摄像机(图1),在一定时间内对编组站连续摄影(图2),然后对日时、改编作业情况、货车数、卡车数等作成穿孔卡片, In the new and modified marshalling yard and freight station before the event needs a lot of investigation and study of the actual situation. Japan studies a more accurate method of automatic investigation and analysis. This method is to install a television camera on the balloon (Figure 1), within a certain period of time on the marshalling station continuous photography (Figure 2), and then on the day, adaptations, truck number, the number of trucks to make punch cards,