HO Scale Steel Alloy Expander Set from Bachmann. With the E-Z Track® Expander Set, you can add to the track included with our train sets or create new configurations of turnouts, branchlines, and double-track mainlines on your existing railroad. Also, a handy track plan manual included with the Expander Set contains ideas to inspire railroad tycoons of all ages. Offered in steel alloy (with black roadbed) or nickel silver (with gray roadbed) versions. Features include: 12 pieces of snap-fit E-Z Track®, including 4 pieces of 9" straight, 4 pieces 18" radius curved track, 1 manual turnout-left, 1 manual turnout-right, and 2 Hayes bumpers, quick, easy assembly on floors, tables, and carpets without the need for special tools or fasteners, helpful track plan manual.