Original: The route from Tsim Sha Tsui Station to Shek Kip Mei Station opened in December 1979.
Simplified: On 1 October 1979, the northern section was opened, with trains running from Shek Kip Mei to Kwun Tong. The route from Tsim Sha Tsui to Shek Kip Mei was opened in December of the same year.