making machines, automatic ticket machines and necessary network equipment; adding the second floor of the South Station Ticket Center Transformed into a VIP area; and opened up the south exit of the east and west outbound passages, so that passengers can directly access the South Square transportation hub. The renovation project of the elevated waiting room was originally planned to start in early April 2012. Affected by this, a total of 159 trains were adjusted for this purpose. However, the railway department considered that the expansion of the elevated waiting room would not only have a high budgetary cost, but would also affect the erection of the elevated waiting room. Due to the inconvenience caused by the platform of the column, the renovation project of the elevated waiting room was finally cancelled, and the existing waiting room resources were used to allocate the passenger flow of the Beijing-Shijiazhuang Passenger Dedicated Line. The Beijing Underground Diameter Line, which was proposed as early as 1959 and connects Beijing Railway Station and Beijing West Railway Station, started construction in December 2005, and was completed and opened to traffic on March 20, 2015. The underground Diameter Line enables both Beijing Railway Station and Beijing West Railway Station to receive and dispatch passenger trains from the Beijing-Harbin Line and other directions. According to the railway development plan, the capacity of Beijing West Railway Station will continue to increase year by year. It is estimated that by 2020, the number of trains arriving and departing from Beijing West Railway Station will reach 137 pairs, including 79 pairs of high-speed trains. Services China Railway Beijing West railway station is a terminal for both "traditional" and high-speed trains. It is the Beijing terminal for most trains leaving the city for destinations in western and southwestern China, including Xi'an, Chongqing, Chengdu, Lhasa and Urumqi. Major "traditional" rail lines beginning at this station include the Beijing-Guangzhou railway (via Wuhan) and the Beijing–Kowloon railway (via Nanchang and Shenzhen). Beijing West is the terminal both for the Beijing–Kowloon through train and (since the opening of the Qingzang railway in 2006) for the Beijing-Lhasa trains. Beijing West is the northern terminal of the Beijing–Guangzhou high-speed railway as of December 2012. High-speed trains leave the station for Guangzhou and Shenzhen, as well as various destinations on the connecting lines, such as Taiyuan and Xi'an. There are, however, plans to construct a new major railway