You will need to first put a meter on the leads of the transformer an see if it is putting out the proper amount of voltage and amperage. The output of each will be listed on the back of the transformer.....ex voltage output will be 12v output. If you eliminate that then you have to go the the track and make sure all of the pieces of track are connected properly. If the current through the track is disrupted then you will not be able to move the train. If this is an older set then cleaning the tracks may help this.
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