As the largest city in Northwestern Ontario, Thunder Bay is the region's commercial, administrative and medical centre. Many of the city's largest single employers are in the public sector. The City of Thunder Bay, the Thunder Bay Regional Health Sciences Centre, the Lakehead District School Board and the Government of Ontario each employ over 1,500 people. Bowater Forest Products is the largest private employer, employing over 1,500 people. Other major employers in the forestry sector include AbitibiBowater and Buchanan Forest Products. Bombardier Transportation operates a plant in Thunder Bay which manufactures mass transit vehicles and equipment, employing approximately 800 people.