Recommended Minimum Curve

Lionel locomotives and rolling stock are thoroughly tested to determine their Minimum Curve requirement. In some cases, a Lionel car or locomotive may be able to easily negotiate most, but not all, possible track configurations for that Minimum Curve. For these products, a Recommended Minimum Curve is also given. This larger measurement allows for all combinations of Lionel track and switches.

Traditional vs. Standard O

Lionel O gauge locomotives and rolling stock are divided into two basic categories—Traditional and Standard O. Both lines are O gauge and can be run together if Minimum Curve requirements allow. Generally, the difference is a matter of size and consistent proportions. Traditional locomotives are sized for Traditional Rolling Stock, and Standard O locomotives are sized for Standard O Rolling Stock. Some other distinguishing features of each category are listed below.