This tutorial covers the Microsoft Train Simulator (MSTS) Shape File Manager: what it is, how to use it, best practices, troubleshooting, and 25 top tips to create, manage, and optimize shapes (3D assets and route objects) for MSTS. Examples and short code/config snippets are included where helpful. What is the MSTS Shape File Manager? The Shape File Manager refers broadly to the tools and workflows used to create, import, edit, and manage MSTS shape files (.s, .smd, .bin etc.), textures, and related config files so objects appear correctly in-game. Core parts of the process include model creation (3D), texture mapping, shape conversion/export, assembling cab and loco shapes, and creating asset/in-game definitions.