NTRAK is an international grass roots association of model railroaders which has created a set of standards that anyone may use to build N Scale model train modules, or model train layout sections. These sections join together to form large portable model train layouts.

These modular train layouts have the flexibility to fit into areas of different size and shape, from warehouses to small bedrooms. Modelling small sections enables even those who live in townhouses or apartments to enjoy the hobby model railroading.

NTRAK also connects together with model railroading enthusiasts who follow the NTRAK Standard the world over.