Which is the busiest tube line?

Related questions

1. Why Moscow Metro is famous?
2. Is an Oyster card cheaper?
3. How old is Moscow metro?
4. What's the oldest Tube line?
5. How much is an Oyster card?
6. Which is the deepest tube line?
7. What time does Moscow metro close?
8. How do you pronounce Moscow?
9. What is the pink line on London Underground?
10. Who made Moscow the capital?

Tags

1. #passengers
2. #network
3. #during
4. #tooting
5. #through
6. #london
7. #stockwell
8. #waterloo
9. #northern
10. #stretch
11. #using
12. #cross
13. #between
14. #stations
15. #guessed
16. #pancras
17. #those
18. #journeys
19. #busiest