original on 30 October 2020. Retrieved 30 October 2020. "香港示威以來首次高官大洗牌傳遞的三種信號" (in Traditional Chinese). BBC Chinese. 22 April 2020. Archived from the original...

2016 at the Wayback Machine，港鐵新聞稿，3 March 2015 阿爾斯通和泰雷兹為香港七條地鐵綫路提供先進的CBTC信號系统 Archived 21 September 2015 at the Wayback Machine，阿爾斯通新聞稿，26 January 2015...