Well after returning my first Athearn 4-6-6-4 SP&S Challenger due to it having a frozen front truck, I received a replacement and tested it on the layout. Unfortunately it too is defective. It would run for a few feet then stop with sound off, lights off etc and then start up again. I called Athearn Technical Support who had me test the locomotive connectivity and it was discovered that only the tender is picking up power from the rails, there is no power pickup from the engine itself. His only solution was for me to send it back to them for repair. To say I am rather massively annoyed with Athearn right now is an understatement. 2 locomotive defective out of the box! Talk about Zero Quality Control. This is the last Athearn Locomotive for me. I decided to return this one to Athearn for repair as I have zero confidence that I can get a good one out of the box and will be forced to eventually go down this route. At least this way I have a reasonable chance of finally receiving a working locomotive.