Pallavan Transport Consultancy Services Ltd · Metropolitan Transport Corporation (Chennai) Limited · Tamil Nadu State Transport Corporation Coimbatore Limited · State Express Transport Corporation Tamil Nadu Limited · Tamil Nadu State Transport Corporation (Madurai) Limited · Tamilnadu State Transport Corporation (Kumbakonam) Limited · Tamil Nadu State Transport Corporation (Villupuram) Limited · Tamilnadu State Transport Corporation Salem Limited · Tamil Nadu State Transport Corporation (Tirunelveli) Limited