Kato USA Model Train Products HV1 UNITRACK R730mm Outer Oval Track Creates a basic oval made from 28 3/4" radius curves that can fit around the HM1 Perfect to expand from the HM1 Set Easy to use assorted track set in a box Includes a basic track oval and a track feeder for supplying power from a Kato Power Pack Reliable and easy-to-use UNITRACK snap track system makes setting up both temporary and permanent layouts a snap