The Harbin-Qiqihar high-speed railway, the technical marvel which operates efficiently at high altitudes and sometimes bitterly low temperatures, is now celebrating its fourth anniversary, according to officials.

The 282-kilometer line -- linking Harbin, capital of Northeast China's Heilongjiang, and Qiqihar in the province -- travels through the northernmost area where the temperature drops to as low as -35 C in winter and hits highs of 30 C in summer.

Since the line opened on Aug 17, 2015, over 57 million trips have been made on the track, officials said.

Over the past four-year period, it has also withstood snowstorms and proved safe and reliable.

The top speed of the bullet trains on the Harbin-Qiqihar line is 350 km per hour, but during the current stage of operation, they travel at slower speeds of 250 km/h.

Currently, a total of 76 bullet trains travel on the line, providing an average of around 40,000 seats for passengers each day.

Joining the Harbin-Mudanjiang high-speed railway, the Harbin-Jiamusi high-speed railway and the soon-to-open Mudanjiang-Jiamusi high-speed railway, the operation of the Harbin-Qiqihar high-speed railway signals a super-fast transport network linking cities in Heilongjiang province.

Passengers are able to travel between major cities in Heilongjiang province, such as Harbin, Qiqihar and Daqing, within an hour.

Officials said the Harbin-Qiqihar high-speed railway is playing an important role in boosting the development of transportation and the economy and trade in the region.