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He explained how to connect a traffic light to a Viessmann 5550 switch box. The connections are the same whether you use the Viessmann or another switch. Each switch has 1 input and 2 outputs. 2 switches are needed to control the traffic light and for the train to stop on a chosen piece of track. After explaining how the switch box works and how to connect everything, we made the connections on the model and tested them.