在複線鐵路上,兩條股道的行車方向是相對的,供上行方向列車開行的股道稱為上行線。在中國鐵路系統中,上行通常指開往首都方向、從支線開往幹線的方向,當列車發站、到站與首都北京的距離無明顯差異時,則由西(南)向東(北)為上行,例如列車經由黔桂鐵路從貴陽開往柳州為上行,從漢口開往南京的列車亦如此。上行旅客列車的車次為偶數。
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