By making each module a particular size and shape, modules can be connected to make a layout of any size. Typically, the club owns the corner modules. The standard modules are generally owned by club members. Many modelers make dioramas that span more than one module. Several modelers might get together and decide on a theme for their modules and even have additional interconnecting trackage, making for a very large diorama.
Many modelers incorporate their modules into a home layout as well.
At large conventions, Several clubs will get together to create a very large layout, showing how versitile and popular modular railroading is. Modular railroading is active in most of the scales. Where no national standards exist, interconnection of modules from two clubs might require special two or more special modules to convert between the two standards. The Triangle area hosts numerous Model Railroad clubs.