Most of those stations make use of a cross-platform interchange system, where the commuter can change to another line on the opposite platform. For example, when a person is travelling on the Kwun Tong Line towards Tiu Keng Leng, getting off at Yau Tong would allow him to change trains across the platform for the Tseung Kwan O Line towards North Point. Whereas, staying on the train and reaching Tiu Keng Leng would allow you to change trains for the Tseung Kwan O Line towards Po Lam.