The Dabbawalas of Mumbai are a large supply chain service that delivers home-cooked meals to office workers. They operate a complex distribution network involving sorting, coding, and relaying of tiffin carriers ("dabbas") through Mumbai's suburban railway system. Key aspects of their operations include a decentralized three-tier structure, a coding system that identifies customers without names, and reliable same-day delivery of over 200,000 meals per day with an extremely low error rate. Their success is attributed to factors like low costs, reliability, lack of strikes, and cultural cohesion within the predominantly Hindu workforce.