Was running on our KSONS NTRAK set up in New Albany IN Library basement. Running a 1st generation Athearn Challenger (4-6-6-4) pulling a multi-car coal train. This was one of the Challenger's with the &@#% MRC decoder. Hit a wrong thrown turnout, caused the engine to jump tracks, the decoder to burp, fry itself (let all that smoke out!) and take a header to the floor. Luckily the floor was carpeted. Didn't really hurt much, just caused me to curse like a sailor, and exclaim "That's it" so much for the %$#@ MRC's. I replaced all of my Challenger's (3 units) decoders with Tsunami sound decoders ASAP! Never looked back and never had another problem.