Thunder Bay Transit is the public transit operator in Thunder Bay, Ontario, Canada. It was formed in 1970, after the amalgamation of the cities of Port Arthur and Fort William and their respective transit agencies. Thunder Bay Transit is a member of the Canadian Urban Transit Association. Thunder Bay Transit is the first transit agency in Ontario to be 100% handicapped accessible, and the first Canadian transit agency to use the NextBus system with passenger counters, fare box integrations and passengerinformation systems.