Kato USA Model Train Products V14 UNITRACK Double Track Inner Loop Set The V14 Double Track Inner Loop Set includes Modern Concrete Ties Super elevated Curves for realistic banked motion (curve radius 11" - 12 3/8") Best to create an inner set of loops for the V11 Set; The V14 Set can be equipped with Double Track Catenary Poles 23-061 (sold separately) Easy-to-transport box with carrying handle Reliable and easy-to-use UNITRACK snap track system makes setting up both temporary and permanent layouts a snap