Are these controllers all junk? I bought my son this set for Christmas and the controller was dead out of the box. Just received a replacement back today and it is yellowed and obviously used. All the functions work but the train runs at full throttle no matter what position the speed knob is in. What is going on with this Bachmann controller? Am I doing something wrong? I bought a cheap Bachman DC controller just so my son could play with his train 5 weeks after Christmas. It works fine with that controller but connect the DCC EZ command and the train has no speed control. Any help would be appreciated.