Line 3, better known as the Scarborough RT, was a Toronto Transit Commission rapid transit line that ran between Kennedy station and McCowan station in Scarborough. Its trains announced Kennedy as the western terminus, where riders could connect to Line 2. After decades of service, the line closed in 2023 and was replaced by bus service while Toronto planned a subway extension. Recordings like this one now circulate among transit enthusiasts as a small audio keepsake of a route that no longer runs.