Live steam (and other self-propelled) locomotives are made in a range of sizes, or scales, according to track gauge. The smaller gauges, sometimes called 'garden gauges' because they can be set up in the owner's own garden, or in the US called a backyard railroad, are sufficient to run by themselves but usually cannot haul the driver or passengers. The larger gauges are usually found on club tracks or miniature railways, and are intended to haul the driver and passengers.