Every Metro Station Master room is fitted with the local workstation which supervises and controls the station’s Mechanical, Electrical & Plumbing (MEP) systems are controlled by Building Automation & Control System (BACS). BACS is a system that controls and monitors Electromechanical Systems like Heating Ventilation and Air Conditioning (HVAC), lifts, escalators, fire fighting, lighting, etc. BACS will work either in remote control mode through Supervisory Control and Data Acquisition (SCADA) controls or in stand-alone mode from the station master room. BACS are accountable for the functions influencing public safety, security and health. Thus BACS, should work reliably, safely, securely and competently. The level of quality and safety management required to avoid random and systematic failures in the design and engineering of the BACS is determined by the Safety Integrity Level (SIL). In this paper, the SIL is determined with the help of the Fault Tree Analysis (FTA) for the Safety Analysis of BACS in Metro Railway Station based on IEC 61508 and CENELEC EN 50129 standards.