Category:Underground rapid transit in the United States

• Underground rapid transit lines in the United States (6 C)
• Underground rapid transit stations in the United States (10 C)

B

• Baltimore Metro SubwayLink (1 C, 3 P)
• Bay Area Rapid Transit (4 C, 26 P)

C

• Chicago "L" (3 C, 3 P)

L

• Los Angeles Underground Rapid Transit (2 C, 2 P)

M

• Metropolitan Atlanta Rapid Transit Authority (6 C, 10 P)

N

• New York City Subway (15 C, 18 P)
• Newark Light Rail (1 C, 1 P)

P

• PATH (rail system) (4 C, 9 P)
• Philadelphia Rapid Transit (1 C)

W

• Washington Metro (5 C, 8 P)

B

• Baltimore Metro SubwayLink
• Bay Area Rapid Transit
• Blue Line (Pittsburgh)
• Broad Street Line
• Buffalo Metro Rail

C

• Central Subway (San Francisco)
• Chicago Express Loop
• Chicago "L"
• Chicago Rapid Transit Company
• Cincinnati Subway

D

• Downtown Seattle Transit Tunnel

F

• Forest Hill station (Muni Metro)

L

• Los Angeles Metro Rail

M

• Market–Frankford Line
• MBTA subway
• Metropolitan Atlanta Rapid Transit Authority

N

• New York City Subway
• Newark Light Rail

P

• PATCO Speedline
• PATH (rail system)
• Pittsburgh Light Rail

R

• Red Line (Pittsburgh)
• Rochester subway

S

• SDSU Transit Center
• SEPTA subway–surface trolley lines
• Silver Line (Pittsburgh)

T

• Twin Peaks Tunnel

U

• United States Capitol subway system
• University Link tunnel

W

• Washington Metro
• Washington Metropolitan Area Transit Authority