Compiled by Jeffrey Kay
Map by John Calnan

June 29, 1964

A new rush hour service installed on Caledonia between Eglinton and Cartwright. Buses run from Gilbert Loop via east on Eglinton and north on Caledonia, looping via east on Cartwright, south on Dufferin, west on McAdam, south on Paul David and west on Brentworth. Buses operated from Lansdowne Garage.

November 23, 1964

The north end looping is revised so that buses operate via east on Cartwright, south on Dufferin and west on Orfus.

An 18 CALEDONIA transfer, circa 1975

October 31, 1966

The north end looping is revised again, to operate via north on Caledonia, east on Bridgeland, south on Dufferin and west on Orfus.

August 15, 1973

Service extended south to connect to the BLOOR-DANFORTH SUBWAY. Buses operate on Caledonia south from Eglinton to St. Clair and then via south on Caledonia Park Road, east on Davenport and south on Christie to Christie station. Service increased to seven days a week, eighteen hours a day.

May 12, 1974

North end looping extended to serve the Yorkdale Shopping Centre. Buses now run via east on Bridgeland to Dufferin and then east, south and west on Yorkdale Road, through the underpass onto southbound Dufferin and west on Orfus.

March 14, 1976

Service transferred from Lansdowne Garage to the newly-opened Wilson Garage.

January 28, 1978

Coincident with the opening of the SPADINA SUBWAY, the north end loop is revised to provide service in both directions on Bridgeland and Orfus, connecting to the new subway at Yorkdale station. The main branch runs via Caledonia and Bridgeland, looping clockwise via Yorkdale Road and Dufferin. A new branch, operating during rush hours, runs via Caledonia and Orfus, looping clockwise via Dufferin and Yorkdale Road.

Paper transfers are required to transfer to and from the subway at Yorkdale.

September 17, 1979

In the north end, buses on both branches now terminate at the new coach terminal adjacent to Yorkdale station. Paper transfers still required to transfer to and from the subway at Yorkdale.

July 26, 1981

Operations transferred from Wilson Garage to Lansdowne Garage.

April 15, 1984

To provide new service on Christie between Davenport and St. Clair and on Davenport, between Christie and Spadina, the southern end of the 18 CALEDONIA route is broken off, with service now provided by 126 CHRISTIE and 127 DAVENPORT buses. Caledonia buses break off the old route at Davenport and Lansdowne and operating south on Lansdowne to Lansdowne station on the BLOOR-DANFORTH SUBWAY, looping via west on Paton and south and east on Wade.

November 26, 1989

Following the successful test run of bus service on Dovercourt road, Caledonia buses are extended from Lansdowne and Davenport via east on Davenport, south on Dovercourt and east on Bloor to Ossington station, returning west and north over the reverse routing. This service replaces the 94B branch of the 94 WELLESLEY bus.

May 13, 1990

Operations switched from Lansdowne Garage to Wilson Garage.

February 12, 1994

Last day of service under this route name. As part of a general reorganization of west Toronto routes made possible by the abandoning of trolley bus service, 18 CALEDONIA service on Caledonia is replaced by an extension of the 47 LANSDOWNE bus. Service is discontinued on Caledonia Park between St. Clair and Davenport. Service on Dovercourt is replaced by the new 161 ROGERS ROAD bus.

February 8, 2026

In conjunction with the opening of the LINE 5 EGLINTON LRT, route name and number restored after 31 years operating from Caledonia Station to Yorkdale Station replacing portions of the 47 LANSDOWNE bus. By coincidence, Caledonia Station is located almost a short distance from the old Gilbert loop where the route was inaugurated in 1964 before being extended southward to Christie Station in 1973.

From Caledonia Station, buses on the 18A branch operate east on Eglinton Avenue West, north on Sanderstead Avenue, east on Bowie Avenue, north of Caledonia Road, east on Bridgeland Avenue, and east and south on Yorkland Road to the bus stop outside Yorkdale Station.Southbound buses operate from the Yorkdale Station bus stop via south on Yorkdale Road, west on South Service Road, north on Dufferin Street, west on Bridgeland Avenue, south on Caledonia Road, west on Eglinton Avenue West arriving at Caledonia Station bus terminal.

Service on the 18B rush hour only branch follows the same path as the main 18A branch except northbound buses turn east on Orfus Road from Caledonia, continuing north on Dufferin Street, and east and south on Yorkdale Road to the bus stop outside Yorkdale Station. Southbound 18B trips run from the Yorkdale Station bus stop via south on Yorkdale Road, west on South Service Road, south on Dufferin Street and west on Orfus Road before continuing south on Caledonia Road.

Buses operate out of Wilson Garage with 12-meter Nova LFS hybrid and Orion VII diesel buses. Rarely, a 18-meter Nova LFS articulated diesel buses may be dispatched.

18 Caledonia Image Archive

	TTC GM New Look bus #7342 pulls up to the entrance to Christie Station in service on the 18 CALEDONIA route. This shot was taken on June 21, 1981 by Richard Glaze.
	TTC GM New Look bus #7542 prepares to turn around via Bloor Street to stop in front of Christie Station in 18 CALEDONIA service. This shot was taken by Richard Glaze on June 21, 1981.
	TTC Hybrid NovaBus #7092 lays over at Caledonia LRT station in service on the newly restored 18 CALEDONIA route, while its colleague, Novabus #7078 pulls up behind, out of service. This photo was taken by James Bow on February 9, 2026.
	A TTC Orders and Notice regarding 18 CALEDONIA operations, effective June 29, 1964. Item donated by Pete Coulman.
	An official timetable of 18 CALEDONIA operations, effective June 23, 1975. Image donated by Pete Coulman.
	The inside of the TTC's official timetable for 18 CALEDONIA operations, effective June 23, 1975. Image donated by Pete Coulman.
	A front rollsign showing 18 CALEDONIA exposures, circa 1985. Image from Joseph Chemerys' Rollsign Gallery.
	The front page of the TTC's official timetable of 18 CALEDONIA services, effective May 14, 1990. Item donated by Pete Coulman.
	The inside pages of the TTC's official timetable of 18 CALEDONIA operations, effective May 14, 1990. Item donated by Pete Coulman.
	An official TTC map of the restored 18 CALEDONIA operations, effective February 8, 2026.
	TTC GM New Look bus #3592 picks up passengers at Yorkdale Plaza on May 15, 1978, in service on the "Orfus" branch of 18 CALEDONIA. The branch is so new, window cards are still being used. The image is from the Patrick Semple collection and is donated by Pete Coulman.