QUOTE: Originally posted by raynbecky I'm wondering if radius is playing a factor here too. I have a 30" radius minimum and have 40 of these cars. Other than the drag issue, you can't run more than 8 cars with a single E-8 on any kind of grade, they seem to work just fine. I also use spiral easements on all turns too. I would imagine on sharper curves they would string line derail due to the drag of the wheels.