Ключевые слова: blocking, caution, construction, danger, development, engine, engineering, equipment, forbidden, handle, hazard, heavy duty, hindrance, industrial, industry, iron, large, loader, locomotive, machinery, maintenance, manufacturing, mechanical, mechanism, metal, obstruction, orange, parked, powerful, prohibition, rail, railway, roadblock, rural, safety, site, stationary, track, tracks, tractor, train, transit, transportation, vehicle, warning, work, yard, yellow,