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

About world's rail news, general news, my train pictures, and travel diary)

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Why did they decide to cooperate?

Seoul and Barcelona metro operators sign co-operation agreement
http://www.metro-report.com/news/metro/single-view/view/seoul-and-barcelona-metro-operators-sign-co-operation-agreement.html

What's the similarity between Seoul Metro and Barcelona?
Though all of the rails in Seoul Metro are 1435mm gauge, railways in Barcelona Metro ranges from 1000mm to 1674mm.
The total length of the system in Barcelona is 123.7 km, while that in Seoul is longer than 1000 km.
And, manufacturers of the rolling stocks do not coincide with each other.
Then, it's mysterious that these far two cities tried to cooperate.