How does it handle O-27 switches?
Reason: historically curves aren't the issue (you just insert a straight between every 2 curves), but O-31 cars tend to rub/scrape on K-Line/Lionel O-27 switches. At least one of our cars has a "nice" white scratch through the green pain--because of the automatic switch's motor.
It says they have a “swing-type draw bar” that allows them to do it. My dad has some K-Line by Lionel passenger cars with such a feature that allows them to handle 0-31 despite being 18” long.