| LINE | Name | Country | City | Regional Rail | |||
| RER | AR | Buenos Aires | Yes | ||||
| CONSTRUCTION DETAILS | Start year | End year | Length (in km) | Tunnel (in km) | Tunnel | Stations | Source | 
| 2020 | 2026 | 20.0 | 20.0 | 100% | 4 | Media | |
| COST INFORMATION | Cost (in M) | Currency | PPP rate | Year PPP | Real cost (in M$) | Cost/km (in M$) | Source | 
| 2300.0 | USD | 2.02 | 2023 | 4646.0 | 232.3 | Media | |
| REFERENCE | https://tn.com.ar/economia/el-gobierno-relanzo-el-rer-el-proyecto-para-conectar-los-trenes-del-area-metropolitana_856411 | ||||||
| NOTES | Sections of the line constructed in trench are represented with the same line style as the at-grade sections. The project maps are based on information retrieved from OpenStreetMap and our research. Please contact us if you have more accurate information regarding this project.  | 
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| Go to Buenos Aires city page. | |||||||