Check out Rail fastening ARS-4 3D model on CGTrader for $15. High-quality mesh by Dufe: 43844 polys, 21968 vertices.
STL (Stereolithography, filesize: 2.09 MB), OBJ (OBJ, filesize: 5.06 MB), MAX (Autodesk 3ds Max, filesize: 4.44 MB), IGE (IGES, filesize: 2.48 MB), DWG (AutoCAD, filesize: 2.05 MB), FBX (Autodesk FBX, filesize: 1.27 MB), STP (STEP, filesize: 1.69 MB)