Hong Kong’s MTR Corporation will carry out overnight signalling upgrade works on Sunday as part of preparations for the partial opening of the Tung Chung line extension later this year. Representatives from the city’s sole rail operator also said on Wednesday that the HK$19.5 billion (US$2.5 billion) project remained unaffected by a counterfeit brick scandal and the full extension was still on track to open in 2029. Upgrades to the existing system will take place in the early hours of Sunday,...