Japan's transport ministry is taking steps to reduce carbon dioxide emissions from trains by introducing a policy to shift from diesel oil to biofuels, starting as early as fiscal 2025. The ministry explained this plan to railway business officials, highlighting the use of biofuels made from euglena and consumed cooking oils as viable alternatives. While major Japanese operators have been exploring trains powered by hydrogen fuel cells, the high costs and long time required for commercial use have presented challenges. Biofuels offer a more feasible solution as they can be directly used in existing trains without significant equipment modifications. Test runs with biofuels have already commenced on West Japan Railway's Gantoku Line, with the ministry intending to share the results with railway companies and work on streamlining the adoption process. However, issues such as the high prices and stable supply of biofuels remain to be resolved before widespread implementation. The ministry aims to collaborate closely with railway operators to overcome these challenges and facilitate the transition to biofuels for a more sustainable and environmentally friendly train operation in Japan.