At 8:45 PM on November 22, the 55252 CRH3A motor train pulled out from the east station of chengdu, marking the beginning of the sicheng high-speed railway from today. At that time, the travel time of chengdu citizens to xi 'an will be reduced from the current 10 hours to about 4 hours.

The line connecting the two capital cities, chengdu and xi 'an and through the southern section of the lanzhou-chongqing railway communication in chongqing, after the completion of the project can strengthen the guanzhong, chengdu-chongqing two big economic zones, improve each area railway north channel capacity, formed to undertake joint and common joint development pattern of the bohai rim, Yangtze river delta economic zone, in the status of road network is very important.

According to China railway chengdu bureau group co., LTD., the operation will continue until the line is officially opened. The railway department used this time to carry out final tests on the whole line of high-speed railway signals, rail, vehicles, stations and other operating units such as passenger service, dispatching command and operation control. It also marks the official countdown to the opening of the much-watched high-speed rail line.

The track is the basis of the train operation, which is guided by the track at run time. Whether the parameters of the track meet the requirements is related to the safety of the train operation and the comfort of the passengers. Under the influence of locomotive vehicle power and natural erosion, the railway line is not only elastic deformation (i.e. the line is still restored after the load is gone), but also produces permanent deformation. The main contents of track deformation include gauge, height, rail direction, horizontal, triangular pit, vibration acceleration and so on. At present, the main line of our country USES the rail car to detect the track state.