Why you guys continually try to operate locomotives on tighter curves than shown in the catalog is beyond me. It's the minimum diameter (3R language) to keep the locomotive and tender from derailing.
Not trying to sound like a j..k. It also is a big surprise when it derails and won't operate on tight curves...HMMM...
There's 3 easy options:
1. Don't buy it if you don't have the minimum curve required.
2. Install the curves if you don't have the minimum diameter required.
3. Buy it and display.
"But, I don't have the room!" is the next post. Reality is harsh-Refer to #1 above.
Not trying to sound like an ###, so please don't take it personal. Black and white to me; you have the minimum curves or you don't: If you don't, then run smaller steamers.
Edited per J Daddy's and Laidoffsick's suggestions below. Thanks