Railway operator MTR on Tuesday said an insulating component on a track switch near Lam Tin Station caught fire, adding that they suspect it was caused by a short circuit.
The incident disrupted Kwun Tong Line services during the evening rush hour.
The fire started at about 5.30pm between Kwun Tong and Tiu Keng Leng stations.
Normal services gradually resumed at around 6.30pm, the MTR said, after the fire was put out and safety checks were completed.
The MTR added that it will conduct a thorough investigation into the cause of the fire.
