Often the object is molded in the proper color, and decals are provided for decoration. Little painting is then necessary. The few tools required are inexpensive. Often the parts will fit together without the use of any tools. The authenticity of commercial kits is very accurate because their design is based on actual blueprints of the real object.
Parts are precast and designed to fit together perfectly.
The development of small motors has done much to increase interest in working models, or scale models that move. Tiny electric, gasoline, steam, and jet motors may be installed in model airplanes, cars, trains, and any other models that have moving parts. Some model airplanes and cars can also be operated by remote control, using radio. Model Railroader Magazine Trains and Railroads Model railroading has long been a favorite hobby both for collectors and model builders. Some families set aside large amounts of space in basements or recreational rooms to house elaborate railroad displays, with tiny villages, trees, figurines of people and animals, and other scenery.