Beijing Subway is the most crowded MRT i ever ride. With the biggest population in the world, no wonder that the Beijing Subway is very crowded. Even my friend said to me that if you still can look your own feet, then the Subway is still not to crowded. For me Beijing Subway is not as convenient as Singapore MRT. The subway itself is operated by two operators, Beijing Mass Transit Railway Operation Corp which operates 13 lines, and the Beijing MTR Corp, a public-private joint-venture with the Hong Kong MTR, which manages the other two lines. The Beijing Subway is the first MRT that opened in Mainland, China. It first line opened in 1969, and the metro network has now grown to 15 lines.