Hong Kong's longest railway line to open fully By IANS | 0 Views Hong Kong's longest railway line to open fully. Image Source: IANS News Hong Kong, June 27 : Tuen Ma Line, the longest railway line in Hong Kong, will fully open on Sunday, running through the eastern and western New Territories and Kowloon. Chief Executive Carrie Lam officiated a ceremony celebrating the opening of Tuen Ma Line on Saturday, saying it was another major transport infrastructure completed by the current government, reports Xinhua news agency. The city government will continue to improve Hong Kong's railway network to make it more convenient for the public to travel, she added.