Photo taken on Sept. 24, 2018 shows a breakthrough ceremony of Ngong tunnel of the Standard Gauge Railway (SGR) in Nairobi, capital of Kenya. China Communications Construction Company (CCCC) has drilled the longest railway tunnel in East Africa, the company said Monday. The tunnel is part of phase 2A of the Standard Gauge Railway that runs from Nairobi to Naivasha town. (Xinhua/Wang Teng)