Building Large Factory with Train Passage by Outland Models Low-poly (Polygon mesh 3D model) is available on CGTrader for $4.99. Original author: outlandmodels. Specs: 5754 polys.
SKP (Sketchup, filesize: 654 KB), OBJ (OBJ, filesize: 219 KB), FBX (Autodesk FBX, filesize: 226 KB), DAE (Collada, filesize: 208 KB)