My son uses a DCS Explorer/Z1000 brick to operate his RealTrax 4' X 8' layout, that consists of an O31 loop inside an O42 loop, with two pair of switch tracks connecting the two loops. The switch tracks and a couple of accessories are powered separately by a Z500 brick.
One loop has a Santa Fe Rugged Rails engine and 6 MTH Rail King illuminated passenger cars. The other loop has a Rugged Rails 2-6-2 steamer and half a dozen cars, including a lighted caboose.
We've determined that this is near the top end of the DCS Explorer's capability.