Compiled by Pete Coulman
Map by Jelo Gutierrez Cantos

July 1, 1954

Service begins on a new suburban TTC service replacing Danforth Bus Line’s TORONTO-STOP 12 service. Buses on CLIFFSIDE run from Luttrell loop at Danforth and Luttrell via east on Danforth Avenue, north on Birchmount, east on Highview, north and east on McIntosh, south on Midland and west on Kingston Road to Danforth. Originally operated by TTC personnel from Woodbine garage (a former ">Hollinger Bus Lines garage located at the southeast corner of O’Connor and Woodbine)

March 31, 1956

Operations transferred to Birchmount garage.

April 15, 1956

Assigned route number 20. During rush hours, four buses operate a 9 minute headway over the 6.2 mile round trip (36 minutes trip time). At all other times, two buses take 30 minutes and maintain 15 minute headways.

September 11, 1961

In order to avoid a left turn from Danforth Avenue onto Birchmount, and to provide a more convenient transfer for northbound passengers, all eastbound buses are rerouted via Danforth, east on Parkette (just south of Danforth) and north on Birchmount, returning to the old route.

May 11, 1968

In conjunction with the extension of the BLOOR-DANFORTH SUBWAY from Woodbine to Warden, buses are extended west from Luttrell loop to Main Street station. Buses operate from Main Street station via south on Main, east on Danforth, east on Parkette Place, north on Birchmount, east on Highview, north on Kennedy Road, east on Park and north on Midland, looping clockwise via Danforth Road and Wolf to Midland, returning via the reverse route (turning right from Birchmount directly to Danforth instead of Parkette Place).

April 21, 1969

A new branch inaugurated, running from Main Street station via south on Main, east on Danforth, north on Warden and east on St. Clair to Warden station. Buses run every twenty minutes from approximately 9:00 a.m. to 3:00 p.m., Mondays to Fridays only.

June 23, 1969

New rush hour service, operating at 15 minute intervals, and Saturday service, operating at 20 minute intervals, added to the 20A Warden branch.

November 22, 1980

In conjunction with the extension of the BLOOR-DANFORTH SUBWAY from Warden to Kennedy, service on Midland (20) branch extended from its on-street loop to operate to Kennedy station via north on Midland and west on Eglinton Avenue. Service removed from Danforth Road and Wolf. No change to the 20A Warden service.

January 5, 1986

Service on the 20A ‘Warden’ branch discontinued, replaced by the new 135 GERRARD bus.

February 17, 1996

As part of a systemwide reduction of service resulting from the elimination of the provincial subsidy for transit operations, weekday late evening and weekend evening service cancelled. Buses on a new 12A branch of the 12 KINGSTON ROAD bus replaces the cancelled service on Midland Avenue.

September 4, 2005

Service rendered accessible with the assignment of Orion VII low-floor buses.

November 23, 2008

As part of the TTC’s ridership growth strategy, weekday late evening and weekend evening service restored on the 20 CLIFFSIDE route, ending the 12A “via Midland” branch of 12 KINGSTON ROAD

May 8, 2011

As part of a general reallocation of resources, service after 10 p.m. on weekends and holidays eliminated.

September 6, 2015

Late evening weekend and holiday service is restored. Buses now operate at intervals of 30 minutes or better whenever the subway is open.

May 13, 2018

As a result of renovations occurring in Main Street Loop, the bus/streetcar loop at the station is closed. This forces buses on 20 CLIFFSIDE to interline with buses on 62 MORTIMER. Eastbound buses stop on the west side of Main Street at Danforth. Westbound buses divert via west on Danforth Avenue and north on Chisholm Avenue. This diversion and interlining is expected to continue until September.

Sunday, September 2, 2018

Effective on this date, the construction at Main Street station ends, and service reverts to its arrangements before May 13, 2018.

Monday, January 6, 2025

A new school tripper is added, providing additional service for the Scarborough Centre for Alternative Studies. This trip will depart northbound from Midland Avenue at Verdun Avenue (Stop ID #1331) at 3:25 p.m. This trip becomes a 34A EGLINTON EAST at Kennedy Station, departing at 3:36 p.m.

20 Cliffside Image Archive

	TTC Orion VII bus #7657 in service on 43B KENNEDY waits in front of Orion VII "Next Gen" bus #8103, in service on 20 CLIFFSIDE, at Kennedy Station on June 13, 2013. Photo by James Bow.
	TTC Nova LFS 8528 travels west on Secord Avenue, approaching Barrington Avenue, in 20 CLIFFSIDE diversion service. Photo taken on April 27th, 2021.
	The TTC advertisement on the Toronto Star shown on the Thursday, November 20, 1980 edition shows major changes related to the Kennedy station opening affecting the routes 9 BELLAMY, 20 CLIFFSIDE, 21 BRIMLEY, 34 EGLINTON EAST, 43 KENNEDY, 57 MIDLAND, 69 WARDEN SOUTH, 86 SCARBORO, 102 MARKHAM ROAD, 113 DANFORTH, and 114 KINGSTON ROAD EAST.
	A map of 20 CLIFFSIDE operations, effective July 2010.
	A scan of the front face of a timetable for 20 CLIFFSIDE, effective February 15,1960.
	An Orders and Notice to TTC drivers on September 11, 1961, detailing the route change at Parkette Place.
	A scan of the front face of a timetable for 20 CLIFFSIDE, effective September 7, 1965
	A scan of the front face of a timetable for 20 CLIFFSIDE, effective September 4, 1973
	This map shows the operation of Danforth Bus Lines in Scarborough Township on September 5, 1950, less than four years after the TTC takeover. Here, you can see the predecessors of 67 PHARMACY (in REGENTS PARK AND EGLINTON), 34 EGLINTON EAST (in Eglinton), PINE HILLS (in MIDLAND & EGLINTON) and 20 CLIFFSIDE (in STOP 14).
	TTC Orion VII "Next Gen" bus sits at Main Street station in service on 20 CLIFFSIDE. This photograph was taken by September 19, 2017 by Marcus Danchuk.
	TTC Fitzjohn Coach bus #1758 is seen here on on Kingston Road, looking northeast across Midland Avenue, in service on CLIFFSIDE in this 1955 shot. Photo by James Victor Salmon, courtesy the Toronto Public Library.
	On the eve of the extension of the BLOOR-DANFORTH SUBWAY to Warden (May 10, 1968), a TTC Canadian Car bus Route 1905 leaves Luttrell loop and passes an arriving DANFORTH streetcar on Kelvin Avenue. Photo by David Wilson.
	TTC GM New Look Route 3703 turns off of Danforth Avenue into Luttrell loop in this 1966 scene. Photo by Peter Cox, donated by Pete Coulman.
	TTC GM New Look bus #3704 turns off of Main Street onto eastbound Danforth Avenue, in service on the "20A Warden Stn" branch of 20 CLIFFSIDE on May 27, 1969. TTC A6-class all-electric PCC 4337, operating on the CARLTON route, keeps on rolling ahead. Photo by Robert McMann, courtesy the Pete Coulman collection.
	TTC Flyer D-901 bus Route 6121 boards passengers in Main Street station in this post 1985 picture.
	This picture shows eastbound TTC Orion VII bus 8134, running along Danforth Avenue near Victoria Park Avenue. Photo by Roman Fomin on May 7, 2012.
	TTC Orion VII bus #7750 enters Main Street station in 20 CLIFFSIDE service on November 22, 2013. Photo by James Bow.
	TTC Orion VII NG bus #8104 in the new Flexity livery as seen on Midland Avenue approaching the Verdun Avenue stop on route 20 CLIFFSIDE heading to Kennedy station. This photo was taken on September 28, 2018 by Jelo Gutierrez Cantos.
	TTC Orion VII "Next Gen" bus #8132 boards passengers at Main Street station in service on 20 CLIFFSIDE on June 13, 2013. Photo by James Bow.
	TTC NovaBux #8519 lays over on the south side of Main Street station loop in 20 CLIFFSIDE service on the afternoon of August 28, 2019. Photo by James Bow.