Auto Rails is a Geometry Nodes tool that generates railway tracks based on a 3D curve input. It instantiates track infrastructure and adjusts it dynamically along the drawn path.

The system includes three preset track environments: modern, high-speed, and traditional, with included procedural textures. The node setup can manage an unlimited number of parallel tracks and features automated catenary wire systems that sag relative to mast spacing. It produces both portal catenary setups for multi-track lines and single-mast arrays for simpler configurations. Users can customize track spacing, sleeper distance, ballast geometry, and mast height through the modifier interface.