Big cousin line. Working has for his money, line 10 still runs smooth, and takes risers through the business district of Beijing. Started as a partial line (Phase 1), it opened in 2008, ready for the Olympics rush, running totally underground, running 24.68 km long, through 22 stations in an "L" shape from Bagou to Jinsong.

Now (Phase 2) Line 10 out-loops line 2, and is now the longest subway line in the world at 57.1 km. It runs through 45 stations with 24 transfers. It is the only line of which every line intersects, except for lines 2