How many subways have Lanzhou opened?

According to Baidu map query, Lanzhou has opened two subway lines, namely Lanzhou Rail Transit 1 Line and Lanzhou Rail Transit Line 2. Lanzhou is located in the geometric center of the land map of northwest China and Chinese mainland. The terrain is high in the west and low in the south, and low in the northeast. The Yellow River flows from southwest to northeast, and canyons and basins appear alternately. Lanzhou has a temperate continental climate. Lanzhou has a history of more than 2000 years since the Qin Dynasty. Since ancient times, it has been a transportation hub and military fortress of "connecting all directions and taking Wan Li first". Named Jincheng, it means "Jincheng Tang Chi" and is known as the "Pearl of the Yellow River". Due to the Silk Road, Lanzhou has become an important traffic artery and commercial port. Later, it became one of the earliest cities in China to accept modern industrial civilization. After the founding of New China, it was identified as one of the national key industrial bases and became an important petrochemical, biopharmaceutical and equipment manufacturing base in China.