SMRT is Singapore's main metro rail operator, incorporated in 1987 as Singapore MRT Ltd and later renamed SMRT Corporation. It operates SMRT Trains Ltd and SMRT Buses Ltd, competing primarily with SBS Transit. SMRT focuses on social responsibility through charitable donations and initiatives for disabled passengers, as well as environmental initiatives like reducing electricity and water usage and receiving ISO 14001 certification. Critical success factors include short turnaround times, cost-effective transportation through integrated information systems, and a modular approach to network expansion and connectivity improvements.