Beijing's first underground library was made accessible for passengers on Subway Line 4 this month. Passengers can scan a QR code in their subway car to read online books for free, according to the Guangming Daily.

The underground library, launched by the Beijing MTR Corporation and the National Library, also gives users access to regular cultural activities. The first activity, "Our Characters," teaches passengers the heritage, meaning, and culture of various Chinese characters, hoping to arouse people's interest in the etymology of Chinese.