A high capacity, multiple-stage railway car switching yard connects together two or more subyards. Each subyard has a fully open arrival/departure end and may have a continuously descending gradient throughout the entire length of its classification tracks. The subyards are positioned opposite one another,...http://www.google.com.mx/patents/US6516727?utm_source=gb-gplus-sharePatent US6516727 - High capacity multiple-stage railway switching yard
