Ottawa Transportation Commission was the public transit operator for the city of Ottawa from 1948 until the creation of OC Transpo in 1973. OTC took over streetcar operations from the Ottawa Electric Railway, but they were gradually abandoned for trolley bus and bus operations. Some streetcars were sold to the Toronto Transit Commission. Routes List of routes as of 1948: Streetcar Routes Line A - Britannia Line H - Hull-St Patrick Line S - Sommerset and Laurier Line R - Preston-Rockcliffe Line B - Bank-Rideau Line E - Bronson Bus Routes Elgin Crosstown Templeton Crerar Fleet Electric Trolley Bus Roster Trolley Bus operation began December 15, 1951, and ran until June 27, 1959 Streetcar Roster Streetcar operation continued from the Ottawa Electric Railway and ran until May 1, 1959 Demo Buses References OC Transpo: Ottawa Public Transit Milestones Ottawa Electric Railway & Ottawa Transportation Commission Tom's North American Trolleybus Pix - Ottawa Transport in Ottawa Bus transport in Ottawa