Hi. I'm am at a loss. Me and my daughter are building a layout it is 6by12. We ran a bus wire which 1 is red and one black. ran 12 feeders. We have the power cab from nice and can run one train no problem with sound. When we put another train on it kicks the Powercab circuit and won't let me run. We checked all wires to make sure we didn't cross one.any ideas would be great. Thanks in advance.