Worked like a dog since I got home from work 3.5 hours ago, and finally completed the inner ROck Island mainline loop, allowing me to run two trains simultaneously on the separate loops. Looks very kewl when they're passing each other in Amarillo, with only 2" track centers. However, I noticed something curious about my Athearn SW1500 switcher. On the inner loop, there are four power feeders to the track. At two of them, the switcher slows down to a crawl and sparks a bit, then after it passes them it speeds back up. At the other two feeders it's fine. Note, the two feeders that are causing problems, are both surrounded by insulfrog turnouts (switched for the mainline of course). My GP38-2, however, flies through all the inner loop feeders just fine. Any thoughts on this one ???? I have another switcher coming for my b-day, so I'll be curious to see if it has the same problems.