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Illustrated postcard showing a red diesel locomotive of series VI, used for shunting and traction services by Kölner Verkehrs-Betriebe AG and Köln-Bonnner Eisenbahnen AG. The reverse details its technical specifications: type Bauart B, delivered in 1957, power 177 kW/240 PS, maximum speed 32/53 km/h, and engine KHD T 4 M 625. The publisher is Kölner Verkehrs-Betriebe AG / Köln-Bonnner Eisenbahnen AG.