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為減少車廂內的行車聲浪，早前港鐵曾為三列「現代化列車」的車門，安裝「充氣門膠」以收隔音之效

然而，所有「充氣門膠」將陸續停用，以免妨礙車廂空氣流通，並恢復原有的車門開關速度

To reduce the running noise being heard inside the train, Inflatable Door Seals were installed on 3 Modernised Train for soundproofing

However, these Seals will be disabled gradually to avoid hindering air circulation and to resume original door operating speed setting