Before revision: Afterwards it was installed: on the Santiago Metro in Santiago, Chile; on some of the MTR lines in Hong Kong (such as the Airport Express and Tung Chung Line), all enhanced with ATO ; and on some of the Mexico City Metro lines in Mexico City .
After revision: Afterwards it was installed: on the Santiago Metro in Santiago, Chile; on some of the MTR lines in Hong Kong (such as the Airport Express and Tung Chung Line), all enhanced with ATO , on some of the Mexico City Metro lines in Mexico City