Liebherr-Transportation Systems has been commissioned by Stadler Bussnang AG to supply propane-based HVAC systems for 16 FLIRT Akku battery-electric multiple units (BEMU) destined for the Austrian Federal Railways (ÖBB). The trains, designed to replace parts of ÖBB’s diesel fleet, are scheduled to enter service in 2028.
The three-car FLIRT Akku trains, each with seating capacity for 160 passengers, will be deployed on non-electrified or partially electrified routes, primarily along the Kamptalbahn in Lower Austria.
Liebherr will deliver HVAC systems that use propane (R290) as a natural refrigerant. Each train will be equipped with three saloon units and two driver’s cab units, with the first deliveries planned for summer 2025.
Roland Friedrich, Global Key Account Manager for Stadler, said:
“We are very thankful for the trust Stadler Bussnang has placed in us. With our propane-based HVAC system we offer vehicle manufacturers and operators an efficient solution for a more sustainable mobility. For us as an Austrian-based company, we are looking forward to further support our customers and local operators applying and servicing propane-based HVAC systems.”
Propane as a sustainable alternative
Propane is increasingly recognised as an environmentally friendly alternative to conventional refrigerants. With a Global Warming Potential (GWP) of up to three, it offers a significant reduction compared with commonly used substances, while providing maximum cooling performance with minimal energy consumption.
Liebherr’s propane-based HVAC systems have been designed with serviceability and safety in mind, taking into account all relevant requirements relating to refrigerant flammability. The technology ensures reliable operation with low downtime, offering operators an efficient and climate-friendly solution.
Supporting ÖBB’s transition from diesel
The deployment of battery-electric FLIRT Akku trains equipped with propane-based HVAC systems will play a role in ÖBB’s wider strategy to reduce reliance on diesel traction.
By operating on routes without continuous electrification, the trains are intended to provide both environmental and operational benefits while maintaining passenger comfort.
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