This study explores the application of Lean Six Sigma methodologies to augment the efficiency and effectiveness of the refurbishment process for the brake valve maintenance workshop. As the demand for reliable and cost-effective transportation systems continues to rise, the maintenance and refurbishment of critical components, notably brake valves, assume a crucial role in ensuring the safety and operational integrity of locomotives. The primary objective of this project is to optimize the brake valve refurbishment production line by implementing Lean Six Sigma principles, with a specific focus on enhancing efficiency. Through process improvements, the study aims to elevate the overall effectiveness of the refurbishment process, ultimately contributing to increased locomotive availability and reliability. This research addresses the imperative need for streamlined refurbishment practices in response to the dynamic requirements of the locomotive industry. This study adopts a qualitative research method approach to explore and explain the application of Lean Six Sigma methods in improving the efficiency and effectiveness of the refurbishment process.