The Harbin–Dalian high-speed railway or Hada High-Speed Railway () is a high-speed rail line connecting Harbin, Heilongjiang and Dalian, Liaoning. Construction work began on August 23, 2007 and the first commercial services began operating in December 1, 2012, nearly one year behind schedule. The line is the world's first alpine high-speed railway operating at high latitudes and low temperatures in winter. The trains can continue operating even with snow on the line and the tracks are fitted with de-icing technology. The project cost CN¥95 billion, which was 25% more than the original budget. At the time of completion, the railway was the northernmost high-speed line in China. The climate of northeast China poses a challenge to the design; parts of the line had to be rebuilt before the opening due to deformation caused by frost heaving. Eventually, it was decided that the route could be opened for commercial services on December 1, 2012; however, during winters (December through March) it operates a winter timetable, with the maximum running speed of . In summer, the service runs an expanded timetable with services running at a higher speed of up to . However, the line has a design speed of up to . The summer high-speed services also have higher ticket prices than the slower winter service; however, some trains continue to run all year at the speed and lower price, giving travellers a choice of speed versus ticket price. Under the winter timetable, the journey from Dalian to Harbin takes five hours eighteen minutes. In summer, the higher speeds reduce the journey time to just three and a half hours. Test runs along the entire railway started on October 8, 2012. These were restricted to the winter service speed of . The first commercial passenger services started on December 1, 2012 with two trains leaving simultaneously, one from Dalian and the other from the new Harbin West station. During the first 52 days of operation, the line transported 2.856 million passengers. By the end of March, there had been 9.4 million passenger trips on the line, an average of 78,000 per day. During the four weeks of the Chinese spring festival, passengers reached peaks of 164,000 per day. Testing of services at the increased summer speed of began in April 2013 after a delay of one month. Commercial services on the summer schedule began on the April 21st, 2013. The line