<Tr> <Td> 3 . </Td> <Td> Washington Metro </Td> <Td> Washington Metropolitan Area Transit Authority </Td> <Td> Washington, D.C. </Td> <Td> 234,232,100 </Td> <Td> 748,800 </Td> <Td> 7005188293248000000 ♠ 117 miles (188 km) </Td> <Td> 6,400 </Td> <Td> 1976 </Td> <Td> 91 </Td> <Td> 6 </Td> </Tr> <Tr> <Td> 4 . </Td> <Td> MBTA Subway ("The T") (Blue, Orange, and Red Lines) </Td> <Td> Massachusetts Bay Transportation Authority </Td> <Td> Boston </Td> <Td> 172,105,800 </Td> <Td> 552,500 </Td> <Td> 7004611550720000000 ♠ 38 miles (61 km) </Td> <Td> 14,539 </Td> <Td> 1901 </Td> <Td> 53 </Td> <Td> </Td> </Tr> <Tr> <Td> 5 . </Td> <Td> Bay Area Rapid Transit (BART) </Td> <Td> Bay Area Rapid Transit District </Td> <Td> San Francisco Bay Area </Td> <Td> 135,310,700 </Td> <Td> 446,200 </Td> <Td> 7005180246528000000 ♠ 112 miles (180 km) </Td> <Td> 4,290 </Td> <Td> 1972 </Td> <Td> 46 </Td> <Td> </Td> </Tr> <Tr> <Td> 6 . </Td> <Td> SEPTA (Broad Street, Market--Frankford, and Norristown High Speed Lines) </Td> <Td> Southeastern Pennsylvania Transportation Authority </Td> <Td> Philadelphia </Td> <Td> 94,209,100 </Td> <Td> 311,800 </Td> <Td> 7004590629248000000 ♠ 36.7 miles (59.1 km) </Td> <Td> 8,496 </Td> <Td> 1907 </Td> <Td> 75 </Td> <Td> </Td> </Tr>

Us cities with the subway fight list answers