Ключевые слова: architecture, assembly, beam, bolt, bolthead, bridge, closeup, corrosion, detail, durable, engineering, frame, girder, gray, grey, grunge, heavy, industrial, industry, infrastructure, iron, joint, junction, metal, metallic, nobody, nut, rails, rivet, rusted, rusty, screw, screwnut, steel, strong, structural, structure, suspension, technology, toughness, track, transportation,