Estonia has made a significant advancement in the field of hydrogen energy by successfully testing a GE C30 locomotive battery using COOLERGIZER, a hydrogen fuel cell-based mobile charger developed by European firm COOLERGY. The demonstration took place at the Tapa Depot, a key location in Estonia's railway network, showcasing the potential for cleaner energy solutions in transportation. The COOLERGIZER, capable of generating up to 80 kW of power and supporting a wide range of voltages, is a versatile tool that can charge locomotives, planes, yachts, and cars. This successful test in Tapa is part of the 'Great Hydrogen Voyage,' a series of hydrogen charging demonstrations across the Baltic region, highlighting hydrogen's capabilities in various transportation sectors. COOLERGY aims to further expand the use of hydrogen power, with plans to test the TGM 4 H2 hydrogen locomotive in Tapa, powered by two COOLERGIZER units. Hydrogen fuel's environmental benefits, such as producing water instead of harmful gases, make it an attractive option for reducing pollution and combating climate change. COOLERGY's commitment to sustainability includes developing liquid hydrogen solutions, constructing cryogenic plants, and promoting renewable energy practices. The 'Great Hydrogen Voyage' continues to showcase hydrogen's practical use in modern transport, paving the way for a cleaner and more sustainable future.