No specifics, just summarize which city has which system.
Alright then, here goes.
Cities with Rapid Transit / Subway Lines
- Atlanta
- Baltimore
- Boston
- Chicago
- Cleveland
- Los Angeles
- Miami
- New York City/Jersey City (#1 in subway mileage)
- Philadelphia
- San Francisco/Oakland/San Jose (#2 in subway mileage)
- Washington (#3 in subway mileage)
Cities with S-Bahn Rail / Commuter Rail Lines
- Albuquerque (New Mexico Rail Runner)
- Atlanta (Georgia Rail)
- Austin (Texas Capital Rail)
- Baltimore (MARC)
- Boston (MBTA Commuter Rail)
- Chicago (METRA, South Shore RR) (#2 in commuter rail mileage)
- Dallas / Fort Worth (Trinity Railway Express)
- Denver (RTD Rail System)
- Detroit (Michigan Transit Detroit)
- Houston / Galveston (Houston Rail Transit)
- Los Angeles (Metrolink, CalTrans Los Angeles)
- Miami (Tri-Rail)
- Milwaukee / Madison (Wisconsin Star)
- Minneapolis / St. Paul (Red Rock Rail)
- Nashville (Music City Star)
- New York City (Long Island RR, Metro-North RR, NJ Transit) (#1 in commuter rail mileage)
- Philadelphia (SEPTA, NJ Transit) (#3 in commuter rail mileage)
- Providence (MBTA Commuter Rail)
- Salt Lake City (Utah FrontRunner)
- San Diego (CalTrans San Diego)
- San Francisco / San Jose / Oakland / Berkeley (CalTrans San Francisco)
- Seattle / Tacoma (Sounder)
- Washington (MARC, Virginia Railway Express)
Cities with Light Rail Lines
- Albany
- Anchorage
- Atlanta
- Baltimore
- Boston
- Buffalo
- Charlotte
- Cleveland
- Columbus
- Dallas / Fort Worth
- Denver (#3 in light rail mileage)
- Detroit
- Honolulu
- Houston (#2 in light rail mileage)
- Indianapolis
- Jersey City / Bayonne
- Las Vegas
- Los Angeles (#1 in light rail mileage)
- Louisville
- Minneapolis / St. Paul
- New Orleans
- Newark
- Norfolk / Virginia Beach / Newport News
- Oakland / Berkeley
- Orlando
- Philadelphia / Camden
- Phoenix
- Pittsburgh
- Portland
- Sacramento
- San Antonio
- San Diego
- San Francisco
- San Jose
- San Juan
- St. Louis
- Seattle / Tacoma
In terms of actual track mileage among all of the systems, Los Angeles has overtaken New York for having the largest amount of track mileage, though New York easily beats all of the others in ridership.
Largest Track Mileage (overall)
#1 Los Angeles
#2 New York City (includes Bayonne and Jersey City light rail and LIRR)
#3 Chicago
#4 San Francisco
#5 Detroit
#6 Washington
#7 Boston
#8 Houston
#9 Philadelphia
#10 Atlanta
Largest Ridership (overall)
#1 New York City (which has a big margin over every other city)
#2 Los Angeles
#3 Chicago
#4 Washington
#5 Boston
#6 San Francisco
#7 Philadelphia
#8 Atlanta
#9 Detroit
#10 Houston