Lanzhou–Xinjiang high-speed railway
A CRH5 high-speed train at the Menyuan railway station
Overview
Other name(s)	Lanzhou–Xinjiang Passenger Railway Lanxin Second Railway
Native name	兰新铁路第二双线
Status	Operational
Owner	China Railway
Locale	Northwest China
Termini	Ürümqi Lanzhou
Stations	31
Service
Type	High-speed rail Heavy rail
System	China Railway High-speed
Operator(s)	China Railway Lanzhou Group China Railway Qingzang Group China Railway Ürümqi Group
Rolling stock	CRH5G, CRH5E, CRH5G/H, CRHXD1D
History
Commenced	4 November 2009 (2009-11-04)
Opened	16 November 2014 (2014-11-16) [1]
Completed	26 December 2014 (2014-12-26)
Technical
Line length	1,776 km (1,104 mi)
Number of tracks	2
Track gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge
Minimum radius	7,000 m (22,966 ft)
Electrification	25 kV 50 Hz AC overhead line
Operating speed	200–250 km/h (124–155 mph) [2] [3] 350 km/h (217 mph) (planned) [4]
Maximum incline	2.0%
Route map Legend Baotou–Lanzhou railway & Longhai railway Lanzhou Baoji–Lanzhou high-speed railway Lanzhou West Lanzhou Zhongchuan Airport ICR Lanzhou–Xinjiang railway Gaojiashan tunnel Yellow River Fuchuan tunnel Chenjiawan West Gansu Qinghai border Minhe South Haidong Huangshui River Haidong West Xining Caojiabao Airport Lanzhou–Qinghai railway Xining Qinghai–Tibet railway Datong West Dabanshan tunnel Datong River Menyuan Haomen Qinghai Gansu border Qilianshan No. 1 tunnel Liuhuanggou bridge Qilianshan No. 2 tunnel Shandanmachang Minle G30 Zhangye West Linze South Lanzhou–Xinjiang railway Gaotai South Qingshui North Jiuquan South G30 Jiayuguan South Lanzhou–Xinjiang railway Jiayuguan tunnel Lanzhou–Xinjiang railway Qingquan South Lanzhou–Xinjiang railway Yumen Lanzhou–Xinjiang railway G30 Liugou South Shibandun South Liuyuan South G30 Hongliuhe South Hongliuhe Gansu Xinjiang border Lanzhou–Xinjiang railway Yandun East Tudun No. 2 interchange Hami interchange Lanzhou–Xinjiang railway Hami Lanzhou–Xinjiang railway Liushuquan South Shisanjianfang Bridge Hongceng South Tuha G30 Shanshan North Turpan North Turpan Jiaohe Airport Daheyan Southern Xinjiang railway Dabancheng tunnel Dabancheng Wetland Lanzhou–Xinjiang railway Yanhu West G216 Lanzhou–Xinjiang railway Ürümqi South Ürümqi This diagram: view talk

The Lanzhou–Xinjiang high-speed railway, also known as Lanzhou–Xinjiang Passenger Railway or Lanxin Second Railway ( simplified Chinese: 兰新铁路第二双线; traditional Chinese: 蘭新鐵路第二雙線; pinyin: Lánxīn tiělù dìèr shuāngxiàn), is a high-speed railroad in Northwestern China from Lanzhou in Gansu Province to Ürümqi in the Xinjiang Uyghur Autonomous Region. It forms part of what China designates the Eurasia Continental Bridge corridor, a domestic high-speed railway corridor running from the city of Lianyungang in Jiangsu to the Kazakh border. The line is also shared with conventional trains.

History

Construction work began on November 4, 2009. The 1,776-kilometre (1,104 mi) railway took four years to complete, of which, 795 kilometres (494 mi) is in Gansu, 268 kilometres (167 mi) in Qinghai and 713 kilometres (443 mi) in Xinjiang. Track laying for the line was completed on November 16, 2013. ^[5] Thirty-one stations will be built along the line. The project costs 143.5 billion yuan. ^[6]

Unlike the existing Lanxin railway, which runs entirely in Gansu and Xinjiang, the new high-speed rail is routed from Lanzhou to Xining in Qinghai Province before heading northwest across the Qilian Mountains into the Hexi Corridor at Zhangye. The rail tracks in the section near Qilianshan No. 2 Tunnel are at 3,607 metres (11,834 ft) above sea level, ^[7] making it the highest high-speed rail track in the world.

The first high-speed train traveled over this line on June 3, 2014. This was a test train with a media contingent with full revenue service not due to start until the end of 2014. ^{[8] [9]} The first segment of the line, the Ürümqi–Qumul part, was inaugurated on November 16, 2014. ^[10] This high-speed railway segment is the first ever railway of that kind to exist in the Xinjiang autonomous region. The rest of the line opened on December 26, 2014. The line cuts train travel time between the two cities from 20 hours to 12 hours. It also freed up capacity on the older Lanzhou–Xinjiang railway for freight transport. ^{[11] [12]}

On November 30, 2017, the Daheyan connection line between the Lanzhou–Xinjiang high-speed railway and the conventional Southern Xinjiang railway opened near Daheyan Town (near Turpan railway station). ^[13] This will allow passenger trains traveling from Urumqi to destinations in Southern Xinjiang (such as Korla) to use the Ürümqi–Turpan section of the high-speed line before switching to the Southern Xinjiang Railway. ^[14]

On 5 December 2021, Shandanmachang railway station opened along the railway. At an elevation of 3,108 m (10,197 ft), it is the world's highest high-speed rail station. ^[15]

Stations

Operational issues

Wind shed risk

Near Shanshan, the railway passes through the hundred- li wind zone^{[ clarification needed]}, where desert wind constantly blows most days of a year. In 2007, strong wind overturned a train on the southern branch of the older conventional rail Lanxin Railway, and four people were killed. ^[16] A 67 kilometres (42 mi) long wind-protection gallery has been built next to the tracks in this region. ^[17]

Engineering issues

Many sections of the line have experienced roadbed settlement, deformation, subsidence, frost heave, and cracking of the concrete of the track bed caused by saline soil, large temperature differences, and extremely low temperatures. ^{[18] [19] [20] [21]}

The 3,769-metre (12,365 ft)-long Zhangjiazhuang Tunnel, located between Minhe South and Ledu South stations, was damaged several times during operation. The tunnel is embedded in mudstone, interbedded with sandstone and gypsum rock. ^[22] The top covering soil layer is loess. In 2016, the tunnel was damaged twice, closing the line for 3 months. ^{[22] [23] [24] [25] [26]} After reopening, the operation speed in the tunnel was limited to 60 kilometres per hour (37 mph). On December 24, 2018, the mountain above the tunnel deformed, but trains could initially continue operating. However, the next day, after further deformation, the tunnel was closed for thorough inspection. ^{[27] [28] [29]} Due to repair works, the line was closed between Lanzhou and Xining until October 11, 2020. Trains were routed over the lower speed Lanzhou–Qinghai railway. ^[30]

Earthquake damage

As a result of the January 2022 Menyuan earthquake, some bridges and tunnels on the line sustained serious damage. ^[31] The section between Haomen and Qingshui North was halted until repairs could be completed. ^[32]

Landslide

In September 2022, traffic on the line was suspended just north of Xining after a landslide caused the deck of a viaduct to shift. ^{[33] [34]}

Economics

An analysis of China's railway network published in 2021 showed that the Lanzhou–Xinjiang high-speed railway has the lowest utilization rate among all high-speed railways in the country, carrying, on average, merely 2.3 million passenger kilometers of service per kilometer of the mainline. In comparison, the average load over China's high-speed rail network is 17 million passenger-km per km, and the nation's highest-volume line, the Beijing–Shanghai one, carries 48 million passenger-km per km. According to the same analysis, a high-speed line would need to carry ca. 36 million passenger-km per km to fully pay its own operating costs. While the Lanzhou-Xinjiang line has the capacity to carry over 160 pairs of high-speed trains per day, it currently only carries 4. ^[35]

As a result of the Belt and Road Initiative, freight transport along the Eurasian Land Bridge corridor increased and the conventional speed Lanzhou–Xinjiang railway sometimes hits capacity limitations, which has led some freight traffic to be shifted to the underutilized high-speed line. ^[36]

References