Why is Harbin subway free?

Harbin subway is free in the ice and snow tourism season, which is convenient for tourists.

According to Harbin Municipal People's Government and Guangming. Com, Harbin Metro Line 2 opened a two-way free passage between Sun Island Station and Ice and Snow World Station, just to facilitate tourists to travel in the peak season of ice and snow tourism. Passengers can get free passes at the intelligent customer service centers of these two stations. This service is an "upgraded version" of the subway tourism service created by Harbin Metro Group to help the world of ice and snow and the Sun Island Snow Expo.