The Mercedes Citaro Solo bus – engine at work
The sounds of the Mercedes Citaro Solo bus engine, recorded at Wola Duchacka bus depot in Krakow. Buses of this type are fitted with engines meeting the EEV exhaust purity standard. In 2018, more Citaro Mercedes models with engines complying with the EURO 6 standard came into operation in Krakow (of which a part are hybrid).
Sound recording: Monika Widzicka
Photo: Piotr Żabicki