Industry 4.0 is the next generation of automation in manufacturing with rapid development affecting manufacturing to intelligent technologies data driven-decision making. Intelligent Factory Systems (IFS) incorporate the latest trends including IoT, cyber-physical systems and Generative AI for productivity gains as well operational excellence. This case study illustrates how Generative AI accelerate manufacturing as it offers seamless process automation, predictive maintenance and responsive production ability. Integrating AI derived insights will enable factories to operate in real-time optimization mode, decrease downtime and boost crew collaboration across the enterprise. This research showcases field-level implementations where production rates have increased and operational costs have decreased with the adoption of AI-driven intelligent systems onto manufacturing equipment resulting in overall equipment effectiveness (OEE) improvements. It also looks at issues, like cybersecurity, data quality and the labor shift from doing to explaining via AI. The study is useful in understanding how manufacturers can use Generative AI to innovate and differentiate in the changing Industry 4.0 competitive landscape.