Just got our son the Iron King 155pc Train Set (sold at Costco) as a Christmas present.  We would like to add a track pack to the set to make the layout more interesting.  The box only says "E-Z Track" and does not specify whether it comes with the "Nickel-Silver E-Z Track (with gray roadbed)" or the "Steel-Alloy E-Z Track (with black roadbed)".  Can anyone tell me which type is in the box?

Thanks!!