Argentina’s First Solar Train Uses Andean Sunshine and Lithium Batteries to Cut Emissions

In the high-altitude deserts of northern Argentina, abundant sunlight is powering an innovative addition to regional transport. Known as the Tren Solar de la Quebrada, the service represents Latin America's first solar-powered railway, operating across a 42-kilometre stretch through the Andes using state-of-the-art technology and locally generated renewable energy.

The train connects six distinct communities throughout the Quebrada de Humahuaca, a valley recognised as a UNESCO World Heritage site that has functioned as an Andean transit route for thousands of years. Originally launched in June 2024, the railway was developed in part to drive tourism to local towns along the historic valley while eliminating the carbon emissions associated with traditional diesel locomotives.

Despite its descriptive name, the Tren Solar does not feature photovoltaic solar panels mounted directly onto its roof. Instead, the two-car passenger transport is propelled by six lithium-ion batteries that are charged using solar power generated within Jujuy province. Additionally, the train incorporates regenerative braking technology, which converts a portion of its motion back into electrical energy during braking manoeuvres and stores it within the batteries for future travel.

According to the railway's operator, this advanced battery configuration provides the train with a driving range between 100 and 120 kilometres. This capacity is more than double the length of its current operational route, giving the service substantial flexibility.

Infrastructure along the line supports the battery-powered operation through dedicated fast-charging points. Stations at Volcán and Purmamarca currently allow operators to recharge the vehicles along the route, and a third charging point is planned for the northern terminus located in Tilcara.

This system allows the railway to operate entirely free of diesel fuel and avoids the need for expensive overhead electrical wiring typically required by traditional electric rail systems. Since returning passenger rail service to the Quebrada de Humahuaca for the first time in three decades, the initiative has attracted significant public interest. Government figures from Jujuy indicate that more than 90,000 passengers have ridden the train since its debut.

The transition away from fossil fuels is also underway in other parts of the global transport sector. Statistical data from Eurostat shows that nearly 58 percent of the European Union's railway network was electrified by 2024. European operators have increasingly turned to renewables, such as the Dutch rail company NS, which has purchased enough renewable electricity from wind and solar sources to match its annual train consumption since 2025.

Meanwhile, technological experiments continue elsewhere. In Switzerland, a start-up named Sun-Ways installed solar panels between the tracks on a short active rail section in Buttes in 2025, producing around 16,000 kWh during its first year of operation. Sun-Ways has since pursued further expansion by signing an agreement with Italian railway infrastructure firm GCF to explore similar installations in Italy.

For remote railways that lack access to a standard electrical grid, Argentina's tourist train model offers an alternative approach. In regions blessed with consistent desert sunshine, the infrastructure required to transition away from diesel may already be readily available.