T-Trak is a modular model railroad system based on a few standards for module size, track placement, track interface, and electrical connections. The minimal standards allow for a wide range of flexibility in design yet still maintain interoperability with all modules built per the standards. The popularity of T-Trak is worldwide allowing for modules from all over the world to connect together.

T-Trak modules are dioramas with sectional track, specifically Kato Unitrack, that snap together to create layouts from a simple circle to large complex layouts. The modules are designed to fit on tables but could just as easily be used on the floor or on a taller bench.