The proof: Mercedes‑Benz recently built Citaro number 55,555, 2 years after the premiere of the first-generation low-floor city bus. The anniversary vehicle was an eCitaro, which is currently the focus of attention. Its drive system is built on an electric portal axle with electric motors on the wheel hubs. The peak output of the engines is 2 x 125 kW, the torque at the driven wheels 2 x 11,000 Nm. Lithium-ion batteries with an overall capacity of up to 292 kWh take care of the power supply. They consist of a maximum of twelve modules. Thanks to highly advanced thermal management the eCitaro achieves tremendous energy efficiency.