The Bachmann HO Scale E-Z Track Expander Set makes expanding the oval or circle included in your train set fast and fun. With this set you can create a fun railrod with four 18" radius curves, one each left and right manual turnouts, four 9" straight sections, a pair of Hayes bumpers and a track plan manual with layout suggestions. This set includes steel-alloy track with molded black roadbed, but it can easily be mixed with gray-roadbed nickel silver E-Z Track too when you decide to add onto your layout.