Which of the 10 busiest rapid transit systems in the US have you ridden?
- New York Subway
- Washington Metro
- Chicago “L”
- MTBA Subway, aka “The T”, Boston
- PATH (New Jersey/New York)
- BART (San Francisco Bay Area)
- SEPTA (Philadelphia)
- MARTA (Atlanta)
- Metro Rail (Los Angeles)
- Metrorail (Miami)
- None of the above
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