Elevation of wharf apron is different from that of back container yard in mountainous rivers,so,land transportation consists of both level conveyance and lift of containers.

• 山区河流集装箱码头前沿高程与后方集装箱堆场高程不可能一致,集装箱码头陆域运输不但要完成集装箱的水平输送,而且要完成集装箱在场内的垂直提升。