Better door maintenance by Alstom, the French company that looks after its trains, is one of several factors that have led to a turnround for the Northern Line, a long, complex line that carries more passengers than any other in London. Passengers dubbed the route, which includes the world's oldest section of deep-level tube tunnel, opened in 1890, the “misery line” in reference to its delays and overcrowding.
法國公司阿爾斯通(Alstom)負責維護北線地鐵列車，該公司提供的更好的車門維護服務，是地鐵北線得以運轉的因素之一。北線線路較長且路線復雜，運載的乘客數量比其它線路更多。該線路于1890年開通，包括世界上深層地鐵隧道中最古老的部分。因經常晚點和過于擁擠，乘客稱其為“悲慘線路”。
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