The railroad with concrete sleepers is made in blender 3d program
BLEND (Blender, filesize: 1.36 MB), OBJ (OBJ, filesize: 466 KB), FBX (Autodesk FBX, filesize: 183 KB), GLTF (glTF, filesize: 4.52 MB), TEXTURES (Textures, filesize: 3.89 MB), STL (Stereolithography, filesize: 398 KB)