Northeast China experiences long, harsh winters with heavy snowfall, posing significant challenges to railway operations. However, the Harbin–Dalian High-Speed Railway, launched in recent years, has achieved year-round, uninterrupted high-speed service and is hailed as a ‘snow-proof and freeze-proof’ high-speed rail model. Its success stems from a combination of innovative engineering and technological solutions.First, over 90% of the line is built on elevated viaducts, which effectively prevents frost heave—a common issue with ground-level embankments in permafrost regions. Second, the track uses ballastless (slab) technology, offering greater stability and resistance to freeze-thaw cycles compared to traditional ballasted tracks. Additionally, the high-speed trains are specially modified for cold climates, featuring enhanced cabin sealing, heated braking systems, and thermal insulation for critical components.For snow removal, intelligent de-icing equipment and real-time meteorological monitoring systems enable proactive responses to blizzards. The overhead catenary system (power supply) is also treated with anti-icing coatings and equipped with automatic de-icing functions to prevent power outages caused by ice buildup.Thanks to these comprehensive, climate-specific measures, the Harbin–Dalian line safely maintains its designed speed of 350 km/h even at temperatures as low as -40°C, setting a benchmark for high-speed rail development in extreme cold regions.
中国东北地区冬季严寒漫长，积雪深厚，对铁路运行构成严峻挑战。然而，近年来开通的哈大高铁（哈尔滨至大连）却实现了全年无间断高速运行，被誉为‘不怕雪不怕冻’的高铁典范。其成功秘诀在于多项创新技术与工程设计的综合应用。首先，哈大高铁采用‘高架桥为主’的线路设计，90%以上路段建在桥梁上，有效避免了路基冻胀问题。其次，轨道系统使用无砟轨道技术，相比传统有砟轨道更稳定、不易受冻融循环影响。此外，动车组列车经过特殊防寒改造，包括密封性增强、制动系统加热、关键部件保温等，确保极寒条件下正常运行。在除雪方面，铁路部门配备智能除冰除雪设备，并建立气象预警系统，提前应对暴风雪天气。同时，接触网（供电系统）也采用防冰涂层和自动融冰技术，防止覆冰导致断电。正是这些针对性强、系统化的技术措施，使哈大高铁能在零下40℃的极端环境中保持350公里/小时的设计时速安全运行，成为中国高寒地区高铁建设的标杆。
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