with other artisanal machine-tool based and allied metalwork pursuits including gunsmithing (particularly in the USA), manufacture of home metalworking tools and accessories, home cnc equipment building, antique machine tool collecting, antique vehicle and machine restoration, home welding and hobby metalcasting. Model engineering is closely associated with the hobby of running live steam locomotives, and overlaps to a degree with the making of non-working models, particularly those of mechanical subjects. Products such as Meccano and low-pressure toy steam engines have a loose affinity with model engineering, stemming from the production of scientific and mechanical toys beginning in the late 18th century. Steam Punk, a post-industrial sculptural art style picking up on the aesthetic and kinetic qualities of old machinery, shares some overlap. There is some debate about the appropriateness of the term 'model engineering'. Some argue that the term 'engineer' should be reserved solely for those professionally qualified as such. However, the historic meaning of 'engineer' is one who constructs or tends engines, and as such is a fitting epithet for those who make working models as a hobby. In any case, since the term 'model engineer' was employed by 1888, the precedent for its use has long been a fait accompli. Model live steam locomotives Model live steam locomotives predominate as the most popular modelling subject in model engineering. As such they deserve special mention. Live steam refers to the use of pressurised steam, heated in the model locomotive's own boiler, to turn the wheels via miniature steam cylinders. Not all locomotives are live steam - some model engineers make model locomotives powered by electricity or internal combustion engines. The criteria however is that the model is self-propelled, hence requiring an engine to be made or motor to be installed, as opposed to the (usually much smaller) model trains that rely on an electrified track to run. 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. Popular 'garden gauges' are '0' gauge, '1' gauge and 2½" gauge (ridable). Usual