After sorting out a short circuit in the front pilot truck, my GS-4 is running pretty reliably now. Turns out the spring under the front pilot was dislodged and contacting two wheels on either side of the truck, causing the short circuit. I had to remove the pilot and set the spring back in place, so it was a fairly simple fix. I took some video of it running on our club layout, pulling a friends Athearn SP passenger consist, along with the BLI observation car on the end. Enjoy!
http://youtu.be/vk63YRs0dHM
http://youtu.be/vk63YRs0dHM