The greatest variety of engines, cars, and other supplies is available in this size, often referred to as HO gauge. This scale offers some of the advantages of the larger size with the maneuverability of the smaller. The larger size of O scale allows the builder to add intricate detail to the engines and cars. The largest size is G scale, which can have any of three proportions. Railroad scenery is a simple part of model railroading because it is easy and inexpensive to make.
Scenery gives the railroad a realistic appearance and hides the carpentry and wiring.
It also makes a small railroad look much larger. The course is a replica of a true race course. It has a slotted track in which an electrical contact strip is embedded. Small plastic model cars equipped with electric motors pick up their power from the contact strip. The course is powered by either an electric power pack or batteries.