What is the longest subway line in NYC?

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Tags

1. #system
2. #through
3. #metropolitan
4. #brooklyn
5. #world
6. #manhattan
7. #subway
8. #authority
9. #subways
10. #transit
11. #northern
12. #miles
13. #operates
14. #rockaway
15. #transportation
16. #longest
17. #train
18. #queens