I finally got the GS4 replacement for the first piece of junk that derailed, shorted out, and should have never been released. So first when I opened the tender to put the DCC decoder in all the parts fell out. The weight, and the brass connections that hold the board. So after spending 45 minutes re-building and installing the decoder I finally ran the engine. Wow!. It pulled my 12 car Daylight consist beautifully. No derailments, no decoder problems. Now lets fast forward to today... I have run this engine maybe an hour, total. And guess what? Derail! What? Why? It threw a traction tire. Barely an hour's running total and already it throws a traction tire. Man am I mad at Kato. Here they produce this beautiful Daylight set and a stunning GS4 to pull it and the engine is crap! I am sending it back to my dealer in the morning for a refund. Unless and until Kato gets its act together and fixed ALL the GS4 problems I'm through. There is no excuse for Kato to produce this great a looking and running engine and not have traction tires stay on more that an hour. I'm done. I'll pull my Daylights with my PA's and E9's. I would love to have used the beautiful GS4, but not with the present production run. Thanks a lot Kato.