Diary of a rail fan in Kansai,Japan(Ver.2)

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Why was the subway line named in such a way?

Wuhan opens three metro lines in one day
http://www.metro-report.com/news/metro/single-view/view/wuhan-opens-three-metro-lines-in-one-day.html

Basically, subway lines in Mainland China are named as the numbers like Shanghai Metro Line 1. But, newly opened Yangluo Line seems to violate this rule. I don't know why the name was allowed.
By this inauguration, Wuhan became the first city that has 7 metro lines in China's provinces without sea shore.