When the engine is switched on, only a low rumble can be heard in the rear: in general, the new six-cylinder in-line Euro VI-compliant OM 936 engine, with 7.7 l displacement, 220 kW (299 hp) output and 1200 Nm torque can scarcely be heard. It is mounted in tower formation in the test vehicle. The cooling system is located immediately above it. With the automatic transmission set to "D" and the parking brake off, the Citaro glides out of the ESWE depot in Gartenfeldstraße, Wiesbaden. The depot is in the city centre, not far from the main railway station.