Buenos Aires Underground 100 Series
| 100 Series | |
|---|---|
A 100 Series train on Line D, before mid-life refurbishment  | |
| In service | 2001-Present | 
| Manufacturer | Alstom | 
| Family name | Alstom Metropolis | 
| Replaced | La Brugeoise cars Siemens O&K Caf Gee  | 
| Constructed | 2001-2009 | 
| Entered service | 2001 | 
| Refurbished | 2015 | 
| Number built | 96 | 
| Number in service | 96 | 
| Formation | 6 cars per trainset | 
| Operators | Buenos Aires Underground | 
| Lines served | |
| Specifications | |
| Car body construction | Stainless steel | 
| Doors | 4 per side | 
| Traction system | Alstom ONIX 1500 IGBT-VVVF  | 
| Track gauge | 1,435 mm (4 ft 8+1⁄2 in) standard gauge | 
The 100 Series are a series of underground railway cars manufactured by Alstom in Brazil and Argentina for use on the Buenos Aires Underground. They are used on Line D of the network, where they make up the vast majority of the fleet, serving alongside some 300 Series and Fiat-Materfer cars. Since 2019, some units have also been used on the Line E.