CAF battery trains begin high-speed trials in Czechia

Battery-electric multiple units from Spanish rolling stock manufacturer CAF have begun dynamic testing in Czechia, in a move viewed as an important milestone for the wider roll out of battery-powered regional trains across Europe.

CAF BEMUs arrive at Europe’s key proving ground

The latest generation of CAF battery-electric multiple units, developed on the company’s modular Civity platform, is now undergoing trials at the Velim railway test centre in central Czechia. The closed testing complex, operated by the Railway Research Institute, is widely used by European and international manufacturers to verify new rolling stock before it enters passenger service.

Publicly available information indicates that the CAF sets sent to Velim are fitted with traction batteries designed to operate on non-electrified stretches while still drawing power from overhead lines on electrified main routes. This dual capability is intended to make the units suitable for regional services where full electrification is not economically viable, an issue that affects many secondary lines across Central Europe.

The move into structured testing in Czechia follows several years of development of CAF battery technology for multiple unit applications. Previous deployments, including battery-equipped Civity trains and tram systems with rapid charging, have provided the basis for the new generation of units now on trial, which are expected to offer longer range, faster charging and improved energy management compared with earlier designs.

Industry coverage points out that Velim’s combination of high-speed circuits, gradients and specialist laboratories allows manufacturers to consolidate many months of real-world running into a shorter, controlled testing campaign. For CAF’s BEMUs, this provides an opportunity to validate performance in battery mode and under the wire, while subjecting the trains to intensive reliability and safety checks.

What the Czech tests are designed to prove

Testing in Czechia focuses on several core areas that are essential for authorising battery trains on European rail networks. Dynamic trials measure acceleration, braking and stability at speed, ensuring that the vehicles behave safely and predictably both when powered from the overhead line and when drawing energy from the batteries alone.

Another priority is energy management. Engineers monitor how the batteries charge, discharge and recover energy during braking, as well as how quickly they can be replenished from the catenary or at charging locations. These data help determine practical operating ranges, optimal charging strategies and the impact of factors such as gradients, temperature and passenger load on real-world performance.

Compatibility with European Train Control System and other signalling and protection technologies is also verified at Velim. Although BEMUs share much of their onboard equipment with conventional electric units, the presence of large traction batteries and associated power electronics requires careful integration with safety systems and electromagnetic compatibility standards.

Finally, ride quality and passenger comfort are assessed through instrumented runs. The weight and distribution of battery packs can influence vibration and noise characteristics, so the tests help confirm that the units will offer a travel experience comparable with modern electric regional trains once they enter service.

Czechia positions itself as a hub for battery train development

The CAF programme reflects a broader trend that has seen Czechia become a focal point for the development and approval of battery trains. Velim has already hosted trials of battery-equipped units from other European manufacturers, while domestic industry has been developing its own BEMU concepts for the national operator and regional contracts.

Reports from the Czech and regional rail press describe how several regions are planning to introduce battery fleets over the next decade, supported by European Union funding and national decarbonisation policies. By hosting testing for both domestic and foreign manufacturers, Czechia is strengthening its role in the wider shift toward low and zero direct-emission rolling stock.

The country’s central location within the Trans-European Transport Network and its existing concentration of rolling stock engineering expertise also support this emerging role. International projects can reach Velim relatively easily, while local suppliers, universities and certification bodies provide a supportive ecosystem for advanced testing and homologation work.

CAF’s decision to bring its latest BEMUs to Czechia aligns with this trajectory and illustrates how the test centre has become part of the standard route to market for new traction technologies. As more operators look to bridge non-electrified gaps with batteries instead of diesel, the volume and variety of battery-equipped rolling stock visiting the country for trials is expected to grow.

Implications for operators and passengers

The successful testing and eventual certification of CAF’s battery-electric units in Czechia could offer operators a new option for decarbonising regional services without undertaking full route electrification. On corridors where overhead lines exist only on the core sections, BEMUs can run under the wire for most of the journey and switch to battery power on branch lines or terminal approaches.

This approach may help reduce diesel use, cut operating emissions and lower noise levels in smaller communities served by unelectrified lines. It can also simplify infrastructure projects, since investment can be focused on key electrified hubs and charging points rather than continuous catenary over long rural stretches.

For passengers, battery trains typically promise a quieter and smoother ride compared with diesel multiple units, along with the interior standards associated with the latest generation of electric rolling stock. Air conditioning, passenger information systems and improved accessibility features are increasingly standard on new BEMUs, reflecting broader trends in European regional train design.

As testing progresses in Czechia, industry observers will be watching closely for indications of range, reliability and maintenance needs in demanding trial conditions. Positive results could encourage transport authorities and operators to include CAF BEMUs in upcoming tenders, adding another competitor to a growing market segment that is rapidly becoming central to Europe’s rail decarbonisation strategy.