Stuttgarter Straßenbahnen AG (SSB) in Stuttgart, Germany, is taking a significant step towards environmental sustainability by introducing ten Mercedes-Benz eCitaro G fuel cell buses with a new pure hydrogen “H₂ mode” drive mode. This move marks the beginning of an initiative to build an emission-free bus fleet in the city by 2035. The buses, equipped with a hydrogen-based fuel cell, can operate exclusively with hydrogen as an energy source, enhancing their environmental friendliness and independence from stationary charging processes. With a focus on improving public transport's environmental impact, SSB aims to transport high numbers of passengers even in challenging terrains. The buses offer long range, significant recuperation benefits, and high drive power, maximizing efficiency and promoting sustainable transport solutions. With advanced safety features and spacious interiors accommodating up to 124 passengers, the new buses represent a fusion of cutting-edge technology and eco-conscious design. By phasing out diesel buses and transitioning to emission-free vehicles, SSB is paving the way for a cleaner and greener urban transport system in Stuttgart.