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Postcard showing an orange diesel locomotive from series VI, used in connection services and works of the Kölner Verkehrsbetriebe AG. The reverse details its technical specifications: 2-stroke KHD T 4 M 525 engine, power 166 kW/225 PS, maximum speed 30/50 km/h, and delivery date 1953. The publisher is Kölner Verkehrsbetriebe AG / Köln-Bonnener Eisenbahnen AG.