Model railroading (US) or Railway modelling (UK and Australia) is a hobby.
The rail transport systems are modeled at a reduced scale.
The models trains include rail vehicles (locomotives, etc.), tracks, signalling, and scenery.
Scales and gauges : The size of the engines depends on the scale being used in models trains and can vary from around 700 mm (28"), down to matchbox size for the smallest ones in Z-scale (1:220).
Landscaping : Some modelers pay special attention to landscaping their model layout, creating either a fantasy world of models trains, or closely modelling an actual location.
Landscaping is also termed "scenery building" or "scenicking".
Weathering : Weathering refers to the process of making a model look as if it has been used and exposed to the weather by simulating the natural dirt and wear on real vehicles, structures and equipment of the models trains.
Methods of power : Model railway engines are generally operated by low voltage DC electricity supplied via the models trains tracks
The exceptions are Marklin and Lionel Corporation, which use AC.
Control : Many modern day model railways use digital techniques and are computer controlled
The industry standard command system of models trains is called Digital Command Control, or DCC.
The best search keywords are layout models trains
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and trains HO.