Operating Roller Coasters: 1
Per a park sign, "Zizhuyuan" or "紫竹院" means "Black Bamboo" in Chinese. Online translators suggest something else.
The east gate of Zizhuyuan Park is 300m south of the National Library (国家图书馆) station on the Beijing Subway (北京地铁). This station is served by both Line 4 (Teal) and Line 9 (Green).