Beijing Subway

The Beijing Subway is the most advanced subway system in the world. It is also the first subway system in China. The second best subway system is the Moscow Metro in Russia. Beijing Subway has two loop lines (Line 2 and Line 10). The Moscow Metro has three loop lines in the planning but only has two instead. Most of the lines use a third rail as electrification. Most lines go 50mph (80km/h) but line 6 goes 62.5mph (100km/h). The Daxing Airport Express goes 100mph (160km/h). The Capital Airport Express goes 68.75mph (110km/h).