The MTR Corporation said early on Monday that it's maintaining services at some lines, despite attacks from protesters, but most of the stations in its network are temporarily closed.
It said in a statement that services for the entire network will end at 6pm on Monday to allow more time for repair.
It says the Tsuen Wan, Ma On Shan and Disneyland Resort lines are all suspended.
Trains are running at eight minute intervals on the Kwun Tong, Island, South Island, Tseung Kwan O, East Rail, West Rail and Tung Chung lines.
On the Kwun Tong line, Whampoa, Ho Man Tin, Yau Ma Tei, Mong Kok, Prince Edward, Lok Fu, Wong Tai Sin, Kowloon Bay, Ngau Tau Kok, Kwun Tong and Tiu Keng Leng stations are all closed.
On the Island Line, Sai Ying Pun, Sheung Wan, Admiralty, Wan Chai, Causeway Bay, Tin Hau and Fortress Hill stations are closed.
On the South Island Line, Admiralty Station is closed.
On the Tseung Kwan O Line, Tiu Keng Leng, Tseung Kwan O, Hang Hau, Po Lam and LOHAS Park stations are closed.
On the Tung Chung Line, Sunny Bay and Tung Chung stations are closed.
On the East Rail Line, Tai Wai, Sha Tin, Tai Po Market, Fanling and Sheung Shui stations are closed.
On the West Rail Line, East Tsim Sha Tsui, Tsuen Wan West, Yuen Long, Tin Shui Wai and Tuen Mun stations are closed.
It also warned that it may have to bring in crowd control measures at some stations, including closing some station entrances or exits and other measures.
Protests have hit the MTR hard over the long weekend.
The entire MTR network was closed down by around 10.30pm on Friday due to vandalism, and the stations remained closed on Saturday. Fewer than half of its 93 stations opened on Sunday morning - only to be hit by fresh attacks in the afternoon and evening and forced to close.