This paper describes how MTR has started embedding the High Reliability Organisation (HRO) characteristics in its organization and Safety Management System (SMS) to sustain its high level of safety and service performance. MTR has also leveraged on HRO to strengthen the safety culture of its workforce in Hong Kong railway operations with over 11,000 staff members. While the concept of HRO is generally applied in high-risk industries such as nuclear weapons, coal mining, petroleum and healthcare, the railway operations of a heavily utilized metro share similar traits and challenges.