C830 train undergoing testing at Centre d’essais ferroviaires (CEF) in Valenciennes, France. (Photo: CEF)

C830 train undergoing testing at Centre d'essais ferroviaires (CEF) in Valenciennes, France. (Photo: CEF)

C830 train undergoing testing at Centre d’essais ferroviaires (CEF) in Valenciennes, France. (Photo: CEF)

C830 train undergoing testing at Centre d’essais ferroviaires (CEF) in Valenciennes, France. (Photo: CEF)

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