Two different kinds of Bachmann G and Large Scale track are available - steel rail on black molded ties as supplied in Big Haulers train sets and Code 332 brass track on brown molded ties. Brass track is compatible with widely used track supplied in Europe and the U.S. and is designed for indoor or outdoor use. Steel alloy track is ideal for use indoors. Bachmann steel and brass track are not interchangeable, but G Scale trains will operate on either.