The Buenos Aires Underground, locally known as “Subte” (short for “Subterráneo”), is Argentina’s primary metro system and the oldest in Latin America, with its first line opening in 1913. The system serves the city of Buenos Aires and plays a crucial role in the capital’s public transportation network.
Key Features
• 6 operational lines (A, B, C, D, E, and H)
• 1 line under construction (Line F)
• 2 planned lines (G and I)
• 90 operational stations
• 54.7 kilometers of network
• Historic wooden cars on Line A (special occasions)
• Integration with bus and rail systems
• SUBE card payment system
Notable Characteristics
• Mix of historic and modern infrastructure
• Preservation of original early 20th-century stations
• Art and cultural displays throughout stations
• Air-conditioned modern trains
• Free WiFi in stations
• Heritage-listed stations on Line A
• Accessibility improvements in progress
• Real-time information systems
Major Interchanges
• 9 de Julio (Lines B, C, and D)
• Diagonal Norte (Lines C and D)
• Plaza Miserere (Lines A and H)
• Retiro (Lines C and E)
• Catedral (Lines A and D)
• Once (Lines A and H)
Construction Methodology and Timeline
Historical Construction (1913-1960)
• Cut-and-cover method
• Shallow tunnels
• Traditional mining methods
Timeline: Variable, typically 3-5 years per line section
Modern Construction (1980-present)
• Tunnel Boring Machines (TBMs)
• NATM (New Austrian Tunneling Method)
• Cut-and-cover for stations
Timeline: 2-4 years per line section
Network Statistics
| Line | Status | Length (km) | Stations | Opening Year |
|---|---|---|---|---|
| A | Operational | 9.8 | 18 | 1913 |
| B | Operational | 11.8 | 17 | 1930 |
| C | Operational | 4.4 | 9 | 1934 |
| D | Operational | 10.5 | 16 | 1937 |
| E | Operational | 11.6 | 18 | 1944 |
| H | Operational | 6.6 | 12 | 2007 |
| F | Construction | 10.5* | 13* | 2027* |
| G | Planned | 12.2* | 15* | TBD |
| I | Planned | 7.3* | 11* | TBD |
*Projected figures
Operating Statistics
Daily Operations
• Ridership: ~1.3 million passengers (pre-pandemic)
• Peak Hour Frequency: 3-4 minutes
• Off-Peak Frequency: 5-8 minutes
• Operating Hours: 5:00 AM – 11:30 PM
System Performance
• Average Commercial Speed: 25-30 km/h
• Annual Passengers (2019): 350 million
• Fleet Size: 218 trains
• Average Trip Length: 5 km
Future Development
The Subte’s expansion plans include:
• Completion of Line F by 2027
• Planning and development of Lines G and I
• Modernization of signaling systems
• Station accessibility improvements
• Fleet renewal program
• Extension of existing lines
• Integration with metropolitan rail network
• Implementation of platform screen doors
Historical Significance
The Buenos Aires Underground holds several distinctions:
• First underground system in Latin America
• First underground system in the Southern Hemisphere
• Historic Line A maintains some original infrastructure
• Several stations declared National Historic Monuments
• Preservation of vintage rolling stock
• Architectural heritage protection programs
The Buenos Aires Underground continues to modernize while preserving its historical heritage, serving as both a vital transportation system and a living museum of urban rail development in South America.
