Ok, here’s the story. I sent my Challenger to a dealer to have a Soundtraxx Tsunami installed to replace the MRC due to really poor performance. I got the loco back in a reasonable time and when I set it on the track it would hardly move. The sound performed in relation to the throttle speed, but not the engine. I talked to the dealer/installer and he had me send it right back. I received an email from the dealer today containing the following information. “I've opened the tender. Disconnected the decoder from the motor. Tested the motor and decoder separately (all ok). Reconnected the motor to the decoder. Reloaded the program as I shipped it to you. It ran fine, even though the radius of my test track is too small for it and the front drivers kept coming off the track. I was all ready to pack it up and send it to you when it stopped running. Something in the loco is preventing the motor from turning.” That’s the situation. I am looking for any help anyone can give that may lead to the light. The loco has been gone for some time and I have been looking forward to running it with the new decoder. Has anyone had a similar problem with a Challenger’s performance? Anything come to mind? I thought the Tsunami was the Holy Grail. I had read good reports on how improved the Challenger ran equipped with one. But my experience has left me Challengerless for nearly three months.