formation of pusher train 顶推船队队形

one column pusher train 一列式顶推船队

multi-row pusher train 多排式顶推船队

flexible connected pusher train 软式系结顶推船队

wedge form pusher train 楔形推顶船队

hollow center pusher train 空心顶推船队

plum flower form pusher train 梅花形推顶船队

shuttle form pusher train 梭形推顶船队

adjustable pusher train 可调式推顶船队 ; 推顶船队