Download the user guide for Central Station 3 in English from the Märklin web-site:
Märklin has released two APPs for smartphones and tablets and one for pc or MAC.
Welcome to digital-train.com - the site that aims at making digital model railroading easy. The site covers DCC, Märklin Digital (Motorola) and Märklin Systems (mfx).
The original purpose of this site was to present my Danish translations of German and English language instructions to digital equipment for model railways / model railroading. The Danish word "Digitaltog" translates to Digital model railway in English. You may find my danish language site www.digitaltog.dk usefull as well.
Later I began to upload samples of my rebuilding old fashioned analogue Märklin trains to digital operation.
Please forgive my English and send me an [E-MAIL] with corrections or comments.
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Märklin 6021 Control Unit - connection table
Plug- and cable colors in the Märklin system (PDF-File)