RailModeller ExpressRailModeller Express 
The latest version of RailModeller Express is 6.6 on Mac Informer. It is a perfect match for 3D Modeling in the Design & Photo category.
RailModeller Express is a free application for building small model railroad layouts with ease. Designed for hobbyists and creators, it offers a clear workspace and extensive accessory libraries to support detailed, realistic planning. This easy railway design software is ideal for beginners and experts looking for a digital model railroad planning tool.
With flexible layer controls, customizable defaults, and drag-and-drop editing, RailModeller Express streamlines every step of your layout creation. Whether you're designing a compact setup or testing ideas for a larger project, it’s one of the best model train layout planners for fast, accurate results.