The MTR has installed a flood detection system at 26 stations, to prepare for the coming rain and typhoon season.

The initiative comes after Wong Tai Sin Station was flooded during a heavy downpour last September, resulting in the partial suspension of the Kwun Tong Line.

Speaking to reporters, the MTR’s Chief of Airport Segment, Ben Lui, said the rail giant had placed flood sensors at 42 entrances and exits.

"When water reaches the sensors, it will trigger an alarm to the station staff. Upon receiving the alarm, the staff will check the CCTV to confirm if there is flooding. If there is flooding, our staff will set flood barriers and temporarily cordon off the affected area. There will also be announcements for the public to use other exits to leave the station," he added.

Lui also said the MTR would suspend all services on above ground sections of the network, including the light railway and airport express, whenever the typhoon signal No. 9 or higher was in effect.

However, if trains were still above ground when the second-highest typhoon signal was raised, they would continue to their designated destinations, or at least to major stations such as Yuen Long or Sha Tin, where passengers could find shelter.

The MTR would also provide water and food for affected passengers under such circumstances.

Lawmaker Gary Zhang said the newly installed flood sensors at station exits would provide early alerts to MTR staff, enabling them to proactively prevent flooding.

However, Zhang, who's a former MTR engineer, expressed concerns regarding the safety of station staff who would need to set up flood-proof barriers themselves amid extreme weather.

"Even for a small station like Wong Tai Sin, there are more than eight entrances, and each entrance has to be installed with floodblocks manually by the station staff. And the manpower is definitely still a concern and also a constraint," he told RTHK.

Zhang said the rail operator was thinking about installing automatic flood-proof barriers at stations to minimise the risks to staff safety.