Line 3 was Toronto's Scarborough RT, a light rapid transit line that ran between Kennedy station in the west and McCowan station in the east, serving Scarborough for nearly four decades. After a derailment in July 2023, the TTC closed the line permanently and replaced it with bus service while a subway extension was planned. Clips of its onboard announcements, including the McCowan destination call, have since circulated as keepsakes for former riders and as authentic audio for Toronto-themed videos, preserving the sound of a transit system that no longer runs.