A new method of sorting railroad cars in yards is presented, whereby outbound trains are built in proper standing order for departure directly on classification tracks, using a continuously sustainable multi-stage sorting process. During this process, cars are easily separated based on priority or according...http://www.google.com.tw/patents/US6418854?utm_source=gb-gplus-share專利 US6418854 - Priority car sorting in railroad classification yards using a continuous multi-stage method
