I just wrote a response to the above thread listed below and the computer ate it.
The curves are indeed 11" radius (not diameter). And believe it or not I myself check this every once in a while. Why? Even I have a hard time believing it myself. And the HO GP38-2s did indeed go through these loops smoothly with zero derailments.
Regarding a pic, I'm 67 and an analog guy; digital things drive me crazy. My son lives out of state but helps me sometimes when he visits. I was able to pull up a pic of the visible loop in my computer's Picasa files, but I'll have to find someone locally to help me turn it into a message or whatever and send it. Or see below:
This may sound crazy, but if one of you could help walk me through this pls send a private email with your phone number and I'll be glad to call you back. Maybe we could get it done. Thanks.
K487 (Doug)