Hong Kong’s MTR Corporation will begin operating its long-awaited new signalling system on the Tsuen Wan line on March 15, marking a critical milestone in a major infrastructure overhaul designed to enhance the reliability of the city’s ageing rail network. The rail giant said on Tuesday that the new system had passed rigorous safety tests and received approval from the relevant government departments. But it also warned of possible glitches during the initial phase of operation and had...