Between 1947 and 1993, the TTC operated a trolley bus system on medium ridership routes. In 1947, the TTC created four trolley bus routes (Lansdowne, Ossington, Annette, and Weston Road) in the west end that replaced streetcar routes. These routes were based at the Lansdowne garage. About 1954, a separate trolley bus division created at the old Eglinton garage (adjacent to Eglinton station) to serve routes on Yonge Street, Avenue Road and Mount Pleasant Road north of Eglinton Avenue. When the Yonge–University subway was extended to York Mills station, the Yonge trolley bus line was closed and its buses were reassigned to serve Bay Street. In the early 1970s, the trolley bus fleet was rebuilt. The TTC leased some trolley buses from Edmonton, which was phasing out its fleet. The last trolley buses ran in 1993 on the Bay and Annette routes. Rather than replacing the aging trolley bus infrastructure, the TTC decided to use CNG buses to replace the trolley bus fleet.