The first of Siemens’ Mireo Plus H hydrogen trains have been given the go-ahead to start passenger operations in Bavaria and Berlin-Brandenburg, marking a significant milestone for Germany’s regional rail transit. Niederbarnimer Eisenbahn Betriebsgesellschaft (NEB) will deploy seven hydrogen trains on the Heidekrautbahn line, aiming to save 1.1 million liters of diesel fuel annually and reduce CO2 emissions by 3,000 tons. In Bavaria, the new Mireo Plus H will replace diesel trains at Bayrische Regiobahn, initially operating in the East Allgäu-Lechfeld network before expanding. These hydrogen-powered trains offer an impressive range of 1,200 kilometers and can accelerate up to 1.1 m/s², providing a sustainable and comfortable alternative for passengers. Siemens also plans to launch a fleet of 31 Mireo Plus B battery trains in East Brandenburg to further enhance energy efficiency in regional rail travel. However, the introduction of diesel Mireo trains in Regensburg-Danube Valley raises concerns about the reliability of hydrogen-powered trains, leading to temporary replacements with diesel rolling stock in the Hesse region. Despite challenges, Siemens remains committed to driving the transition towards eco-friendly and innovative rail transport solutions.